Here's everything you need to know about the best time to visit Greece and the Greek islands. Includes the best time to travel to Greece for sun, sea, beaches, outdoor activities and more!
Choosing the best time to visit Greece
Planning your next vacation, and wondering when is the best time to visit Greece? Let me help!
After four years of living in and writing about Greece, I've got some great travel advice to share. From when to visit Greece for tourist free summer sun on the Greek islands, to the best time to visit Athens, here's what you need to know.
Best months to visit the Greek islands
Some of the Greek islands close down during the winter months. Other Greek islands get super busy at certain times of year, particularly in August. Here are the best months to visit the Greek islands.
- Best time to visit Santorini: April, May, June, September, October, November
- Best time to visit Milos: June to September
- Best time to visit Mykonos: June, July, September
- Best time to visit Crete: June to September
- Best time to visit Zakynthos: June, July, September
- Best time to visit Naxos: June to September
- Best time to visit Kefalonia: June to September
- Best time to visit Patmos: June to September
When to visit Greece for weather and activities
Here's a condensed guide on the best time to travel to Greece for various activities and interests.
- Best time to visit Greece for the Weather: May and June, September and October.
- Best time to visit Greece for Swimming: Between April and October.
- Best time to visit Greece for Sightseeing: Between April and June, and September and October.
- Best time to visit Greece for Greek Island Hopping: Between May and October (avoid August!).
- Best time to visit Greece for Cycling: Between May and October (Avoid August!).
- Best time to visit Greece on a Budget: Between October and March.
- Best time to visit Greece for Skiing: Between December and April.
Let's take a look at the best time to go to Greece in more detail.
The best time to travel to Greece is…
There's no time like the present!
Whenever people ask me “When is the best time to visit Greece?”, I reply “Right now!”. Greece is a fantastic country to visit all the year through no matter what the season.
With that said, some months are definitely better than others depending on what your image of an ideal vacation is.
As an honorary local, let me introduce you to the best time to go to Greece based on as many different holiday types as I can think of. I've also included some of my own travel experiences in Greece where I think they might help.
When to go to Greece
If we are talking about general summer type vacations, the standard answer on when is the best time to visit Greece, is between the months of April and October.
During this time, you can be more or less guaranteed of good weather, the sea is warm enough to swim in, and the tourist infrastructure is open for business.
There is one small problem though. Everyone, and I mean EVERYONE seems determined to visit Greece in August!
This is a real shame for a number of reasons.
Greece in August
Firstly, the weather can be insanely hot during August. That sounds great in theory, especially if you are coming from colder climes, but in practice it can really sap the energy from you, making sightseeing a bit of a drag.
For this reason, when people ask me when is the best month to visit Greece, I always say to avoid August!
Secondly, there are just too many tourists, and these are only added to by the Greeks themselves who also decide to take their own summer vacations at this time en masse.
Thirdly, prices shoot up for accommodation, and it can become harder to find rooms by the coast. In short, if you do have a choice on when to visit Greece, maybe you might want to avoid August.
Athens in August: The Exception to the Rule
There's always an exception to the rule however, and so it is in this case when it comes to visiting Greece in August. You see, whilst everyone makes a mad dash to visit the coast in August, Athens is left virtually deserted.
August in Athens is actually my favourite time of year in the city. There's minimal traffic, at least 75% fewer people, and you can even find car parking spaces. Crazy right?! So, if you want to visit Athens during a quieter period, maybe August isn't so bad after all.
What If I Don't Have A Choice?
I totally understand that some people are restricted by their circumstances, and that August may be the only month they can take a holiday in Greece. If you are in this position, it pays to plan ahead.
My advice is to book your flights and accommodation well in advance, especially when it comes to those super-popular Greek islands such as Santorini and Mykonos. Make sure you get a room with air-con as well, as you might need it!
Best times to visit Greece
If you do have some choice over what time of year to visit Greece though, this following quick guide might help. I've put down a bunch of different Greek vacation ideas based on activity as well as by month.
If you don't quite fall into any of these categories or want to ask a question, please leave a comment on the guide at the end. I'm always happy to help people with their Greek vacation plans!
Please note – I'm including August in the lists, but I hope my message about trying to avoid it got through!!
Best time to visit Greece for weather
There's lots of sunny weather between May and October, with July and August being the very hottest months. If you see rain during these months, you should consider yourself witnessing something of a rare miracle, especially on the more southerly islands!
Talking of which, there is one small issue to keep in mind. The ‘Meltemi winds‘ can occur from mid-May to mid-September. These are dry, surprisingly strong winds that come in from the north Aegean Sea. There's no real predicting when they will happen, as they just arrive and last for 3 or 4 days before dying down.
The Meltemi winds have the bonus of being great if you are into windsurfing and want to cool down from the heat. They are not so good if you want to relax on a beach, and the wind happens to be blowing in the wrong direction!
If they do happen when you are on holiday on a Greek island, ask the locals if they know of any beaches which might be sheltered from them.
Best time to visit Greece for Cycling
I'm on something of a mission to encourage people to cycle more in Greece! What it lacks in cycling infrastructure it makes up for in varied landscapes. Check out my recent Hercules Bike Tour of the Peloponnese!
If you are planning to cycle in Greece, the best months are May and June, along with September and October. These months will provide warm weather with less chance of rain.
Last year I cycled in Greece during August for a week, which was pretty hot. It reached above 36 degrees for most days. Don't be like me!
Best time to visit Greece for Sightseeing
Personally, I find it a lot easier to wander around some of the excellent Greek archaeological sites in cooler weather than when it's very hot. With this in mind, the best months for sightseeing are probably May and June, along with September and October.
You still get the benefits of the ‘summer hours' for archaeological sites then as well. During the winter months, the opening hours are reduced, with many main sites closing at 3 in the afternoon.
Best time to visit Greece for Swimming
Some hardy souls will tell you that you can swim in Greece all the year around. It's not quite for me, and the latest I've braved the waters has been November, getting in again in late March. The rest of the year you are going to find the waters quite lovely for swimming.
Best time to go to Greece for Island Hopping
Avoid the month of August and you'll find that any month between May and October is great for Greek island hopping. I've not written a guide to Greek island hopping yet, but I'm sure when I do, I will be mentioning how you should allow for possible ferry delays and strike action.
Don't plan your timetable too tight! You might find this guide on the best time to visit Santorini useful. There is a little information inside about other Greek islands to visit from Santorini as well.
Best time to visit Greece for Skiing
What – Skiing in Greece? I hear you ask. Yes, you read it right. Greece has a couple of excellent ski resorts, with perhaps the most popular being Mount Parnassus near Arachova. It's just a few hours drive from Athens, and is also quite close to Delphi.
The ski season in Greece starts in December, with January being the most solid month. The ski season can go on until May depending on the snow that has fallen.
If you were visiting Delphi on a day trip from Athens in April, you might perhaps consider staying longer if you hear that the slopes are still open.
Best time to visit Greece on a Budget
Greece is a very affordable country to visit at any time of year, but the cheapest time to go to Greece is during the off-season.
The absolute best time of year to visit Greece on a budget, is between the months of October and April. Accommodation is easy to find and often at a much discounted rate during this period.
This is a great time to visit Greece in terms of value for money, although some of the tourist infrastructure does close down.
I loved visiting Santorini in November for example, as the temperature was still pretty good but there were virtually no tourists.
Counterbalancing this though, was a reduced selection of places to eat and drink at night. Still, I enjoyed my time on Santorini in November, and found it the ideal time to hike from Fira to Oia.
Budget minded travelers might want to check out this guide on the Greece currency, ATMs and using cash.
Enjoyed the read? Why not pin this blog post about the best time of year to go to Greece for later?
The best time of year to visit Greece
Dhruv says
Hi Dave
Thanks for putting such an informative blog together. It is really amazing. I was planning to visit Greece in early November for our honeymoon for 10 nights. Can you recommend the best possible itenary we can have?
I was interested in beaches, quiet surroundings and beautiful places to visit. Apart from Athens and Santorini what could be another island? Any help would be appreciated.
Thanks
Dave Briggs says
Hi Dhruv,
Congratulations on your forthcoming wedding!
Early November is really the start of the off-season for the Greek tourist industry.
Some islands, such as Santorini, are extending to being year-through destinations.
Crete, the largest island, doesn’t close down at all.
As such, my suggestions would be something like Athens – Santorini – Crete – Athens.
When in Athens, consider a day trip to Delphi.
Dhruv says
Hi Dave, thanks for the reply. As you suggested its the start of the off season, if you don’t mind, would you advise coming to greece at this time of the year? I want to have a good trip but obviously wouldn’t want some of the prime tourist spots being closed or the weather being too chilly. Also can you suggest some activities that i can do while visiting these places?
Thanks a lot for your help in advance.
Pamela says
Hi Dave! Thanks for the info on your site! I am heading to Greece in September, traveling alone. I’m planning on a mix of independent and guided touring. I’m looking at the ferries for my island hopping opportunities. I know there can be delays. Can you share any more info on the ferries, or other good ways to island hop? I’ll be in Athens to start, with a short guided tour scheduled for classical Greece (Delphi, Mycenae, Olympia). Not sure why I’m feeling timid about using the ferries. Could just be lack of that experience.
Dave Briggs says
Hi Pamela!
By coincidence, I have just written a whole collection of blog posts on different ferry routes.
To make things easier though, this site should be your first port of call (forgive the pun) – Ferryhopper
This is by far the easiest site to book ferry tickets on.
Now onto my blog posts which you may find useful:
Greek Island Itinerary for 14 Nights / 16 Days
Greece Itinerary: 7 Days in Greece for First Time Visitors
How to get from Athens to Santorini – 2019 Travel Guide
Also, feel free to join our facebook group and ask any questions you may have: Real Greek Experiences
Stacey says
Hi Dave
This blog post is super informative. I am looking to visit Greece in October for three weeks. My plan was to visit Santorini, Sifnos, Milos, Chania, Monemvasia and I would love to add in Assos (Kefalonia) and Zakynthos if time permits. I was hoping you could offer some advice as to whether the ferries will be running between those islands during Oct. I saw above you mentioned you have been swimming in Nov and I was wondering if you think the water is comfortable in October?
Dave Briggs says
Hi Stacey,
Sounds like a great trip you have planned!
For ferries, the timetables may or may not be ready yet for October. Ferries.gr is a good site to keep an eye on timetables.
You might also want to keep in mind that flights might also be an option between some destinations.
I personally think the water will be warm to swim in October on sunny days.
If you’ve not already, please sign up for my free guides which i send out of the course of a couple of weeks! – Free Guides to Greece.
Elena says
Hi Dave,
We are looking to cycle in Greece beginning in mid April. Have looked at many of your sites, initially found you with the Hercules tour of the Peloponnese. We plan to travel as inexpensively as possible, and wild camp where appropriate. Do you have a daily budget estimate, including local food and market eating?
Dave Briggs says
Hi Elena,
Greece is a great country to cycle around – but prepare for hills!
Bike budgets are always a tricky one come up with.
I wasn’t particularly trying to save costs on my Greek tours, and ended up spending 750 euros per month for one person based on cheap hotel rooms for 80% of the time.
For two people (because of shared accommodation) that could be say 1300 Euros for 2 people.
If wild camping religiously, cooking two meals a day, and eating one meal out, you could get by on as little as 10 – 15 euro a day each.
Happy tailwinds cycling in Greece!
BTW – I have a bike touring newsletter you might be interested in. You can find the signup form on this page – Bike Touring Tips.
Tiffany says
Hi Dave,
A friend and I are looking at travel to Greece this spring, potentially over Easter. My thoughts on itinerary are Athens, the Peloponnese, and Crete, but these are initial thoughts. I want a balance between ruins, cultural experiences, great food/wine and some quality beach time. For this reason, my preference is for a summer trip. My friend leans toward spring and will want more active pursuits like biking, hiking, or tennis. Will I freeze my bum off at the beach?
Greek Easter is the last weekend of April this year, so maybe the weather will be beach friendly? I also like to scuba dive.
Dave Briggs says
Hi Tiffany,
I hope you are well!
Your itinerary sounds great – all my favourite places!
I’m not sure how long you will be visiting for from the information given, but it might have an influence on how long to stay in each place (or even cut one area out if just a week).
I would personally veer more toward the summer for stability of weather and warmth of the waters for swimming.
That said, I went bike touring in Greece in April, and had plenty of 30 degree days!
Given the activities you’d both like to do, I’d say June is probably the best month overall.
If you’ve not already, please sign up to my Greek newsletters – There will be some useful info in there which will get sent out to you over a series of days that might help you plan the trip to Greece – Free guides to Greece.
Kei says
Hi Dave,
We are planning to visit Greece from Sept 29th for 14 nights/16 days. We are interested in Athens, Naxos, Santorini and Rhodes, and if possible to add Paros in the itinerary.
1. Which island would you suggest to start/end (via ferries or flight) and fly back home to Toronto? 2. If we need to choose between Naxos and Paros, which island would you recommend? 3. Is it easy to get around via buses within each of the islands? 4. Also would love to hear your hotel/area suggestions for each of the islands.
Thanks in advance for your help!
Dave Briggs says
Hi Kei,
Apologies for the delay in responding. Turns out my answer went on for a bit, and I ended up turning it into a blog post!
Here’s the answers to your questions – Greek island itinerary.
Have a great trip to Greece!
Shekhar says
Hi Dave
I’m planning to visit Greece with my mom in the first week of April 19.
We plan to spend about 3 days in Athens and another 3 days in Crete.
Will it be cold or rainy around that time? I was wondering if I should travel in May instead.
Dave Briggs says
Hi Shekar,
I hope you are well!
It’s difficult to tell exactly what the weather will do.
It’s unlikely to be cold, but no one can predict the rain.
Typically, the weather gets warmer in Greece from Mid-April on.
Perhaps if you have a choice May would be the best time of year to travel to Greece for you.
Stephanie says
Hi! I find this article very helpful, however, I have one question: If I want to visit santorini between april 10th-16th, is it a good time to do it? considering that I live in a tropical country where temperatures go from 25 C to 30 C all year round, so I´m not use to cold weather, and I´m expecting to be able to relax by the pool and swim in the ocean.
Thank you for your help!
Dave Briggs says
Hi Stephanie,
I hope you are well!
I think that April is a great time to visit Santorini in terms of there being less tourists.
However – I don’t think you’ll be swimming at that time of year. Personally I find it a little cold, and if you come from the tropics you might too!
If any of the hotels have a heated pool option, that might be a wiser choice. If not, I’d question the need for a hotel with pool unless you are feeling brave!
In terms of swimming in the sea – Almost definitely not at that time of year. If you take the Santorini volcano tour though, you can swim in the hot pool section during the tour.
Enjoy your trip to Greece!
jane smith says
Hi-We are thinking of coming to Greece the first 2 weeks of September and would like to see Athens, Santorini, Naxos and Crete. I know August is really crowded but what should I expect in early September? Should I be worried about crowds especially in Santorini? Are there islands that would feel less crowded and touristy in early September? thanks, Jane
Dave Briggs says
Hi Jane,
I hope you are well!
I think that September is the perfect month to visit Greece, as most European’s holidays are over with by then.
You might expect a little crossover on the first few days of September though, depending on how the holidays fall (it varies from year to year).
Unfortunately, Santorini is a bit of a victim of its own success. The later into your vacation you can leave visiting there the better. Don’t expect to have the island to yourself though, and sunset can be a bit of a crowd so get there early!
If you are looking for a more low-key island, Milos might be worth considering. Here’s my Milos travel guide so you can check it out.
Shrutee says
Hi Dave..
Hope you are doing good… we are planning for our honeymoon trip to Greece on 29th April till 7th May 2019..
And planned to visit Athens, drive to Napflio & Meteora and then ferry to Santorini..
Just wanted to know whether there are more places better than this which you suggest to replace with..
And also need some hotel suggestions in Santorini and Athens..
Thanks in advance and have a good day..
Dave Briggs says
Hi Shrutee,
I hope you are well!
I think you itinerary may run into problems with Nafplio as it’s in the wrong direction so to speak.
You can do it just about – but you’ll be doing a lot of driving!
Might I suggest dropping Nafplion, and on the way from Athens to Meteora, you stop by at Delphi instead(one of the best sites in Greece).
Here’s just an idea for you:
Arriving in Athens:
With two people, it’s cheaper to get the bus or metro from the airport to the centre. Read my guide here.
If you do want a taxi, you can pre-book taxis here at no extra cost – Welcome Taxis.
Where to stay in Athens:
My recommendations for staying in Athens are always to stay somewhere near the historic centre. This way, you’re within easy walking distance of everything you want to see.
I’ve got a post here about it: Hotels near Athens centre
Budget hotels in Athens: Note – they are not in the best areas!
What to do in Athens:
I think for sightseeing, my 2 day guide to Athens would be useful – 2 days sightseeing in Athens.
On day 3, drive out to Delphi.
After seeing the site, continue on to Meteora and stay the night.
Places to stay in Meteora: Hotels near Meteora.
Day 4 – Sightseeing in Meteora
Then, stay a second night.
Head back to Athens the following day.
Transport to and from Santorini :
A combination of ferries and flights would be the best choice, which way around you do it will perhaps depend on your flights into Greece.
Personally, I would definitely want to fly back into Athens to get the plane home rather than take a ferry (just in case it’s delayed or strikes).
Skyscanner is a good way to keep an eye on flight prices – Skyscanner
I also like Google Flights as a way to monitor prices.
For ferries, take a look at Aferry.
You don’t really need to book ferry tickets well in advance for foot passengers though. It’s probably cheaper directly through the ferry company website if you choose to do so.
Things to do in Santorini:
I’ve got a few posts about things to do in Santorini here: Santorini Travel Blog
Cheaper places to stay in Santorini – Santorini Hostel, San Giorgio Hotel, Villa Roussa
I hope that helps toward your travel planning!
Pronetri Guha says
Hi Dave,
I am planning on a honeymoon trip to Greece, in the first week of March, do you think it is is a good idea? The other option for me in Spain, which one is a better option do you think???
Please reply!
Dave Briggs says
Hi – I hope you are well!
Congratulations on your forthcoming marriage, and I hope you enjoy your honeymoon!
Of course, I will always say choose Greece over Spain – But I am biased!!
In March in Europe, there are no guarantees for great weather at that time of year – literally anything can happen.
What I would say though, is that this would be a fantastic time to visit Santorini (which is a very popular honeymoon destination).
There will be far fewer tourists at that time of year, and you’ll get all those great photos of the buildings.
All the important ancient sites in Greece are open all the year through as well.
In terms of beaches and swimming – It will be far too cold to do that in both Greece and Spain at that time of year.
Vamsi Vallabhaneni says
I am planning a trip to Greece in mid to last week of November. I wanna visit Athens, Santorini and Mykonos. Is this best time to visit these three places ??
What should my travel plan be like ??
First Athens, then Santorini followed by Mykonos or First Athens then Mykonos and then Santorini ??
Dave Briggs says
Hi Vamsi,
I think November is a great time to visit Athens (Any time is actually!) – Just keep in mind that archaeological sites may have shorter opening hours.
Santorini – I personally visited in November and really enjoyed it. We were lucky with the weather that it was clear skies. There are much fewer tourists, although some businesses will have closed for the winter.
Mykonos – No personal experience of visiting Mykonos in November. It really depends what it is you want to see and do when there. Many people head there for the beaches and the nightlife – November would be the wrong time of year for that.
I would consider swapping Mykonos out for spending more time on the Greek mainland.
It doesn’t matter what order you do anything in – Just remember to leave enough time between connections to allow for bad weather delaying ferries (if you are not flying).
Myrna Gotauco says
Hello Dave,
We plan to travel by june 10,2019..I am interested to go to Athens ,myconos,Delphi,Santorini,and Crete..I plan to book a hotel in Athens only and get the tours to the islands I mentioned thru viator or tripadvidor ..I have been getting tours from them from my previous tours to other countries ,will these be a good idea ? Will the month of June be good enough for sightseeing? ..
Thank you,
Myrna
Dave Briggs says
Hi Myrna,
I hope you are well!
I think June is an excellent month to travel to Greece – particularly for Santorini and Mykonos.
(The sea might not be at its warmest, but I’m sure you will be fine!).
If I understand you correctly, you would ‘do Athens by yourself’ and book your own hotel.
You would then book tours that would take you to the other places? (Note – I’m sure you know, but you can’t make day trips from Athens to Santorini, Mykonos, or Crete). So, the tours you take would need to include accommodation at each place.
If you feel comfortable using Viator and Tripadvisor then sure go ahead and use them.
Personally, for day trips, I find that Get Your Guide offer the same but a little cheaper – and the site is easier to use!
If you are looking for a bigger all in one travel package for Greece, TourRadar offer some nice ones. Here’s a sample itinerary.
Be sure to sign up for my free travel guides for Greece for more inspiration!
Tinku bhora says
Hi Dave, hope you doing well!
Me and my wife are traveling to Greece on 6th August for 2 weeks and would be visiting Athens, meteora, Mykonos and santorini. We are foodie and love to party and would like to go for adventure activities. Our stay is all booked. I would like to know how much average daily expense we should look at including ferry tickets to Mykonos. Also, do you suggest us to take a cruise in santorini?
Thanks in advance. Cheers!
Dave Briggs says
Hi Tinku,
It sounds like you have a great vacation in Greece ahead!
It’s really difficult to give estimates on daily expenses because everyone is different. You could estimate around 30 euros for an evening meal for two at a traditional tavern. Start adding on extras for drinks of course! Greece is an affordable country, but you can spend as much as you want!
I would strongly suggest you book ferry tickets in advance if travelling to Santorini in August.
A Santorini cruise is a very good way to appreciate the island. Take a look at these day trips from Santorini to see which one suits you best!
Tinku bhora says
Thanks a ton mate. I pray for the affected families in the recent wild fire incident. May God bless them.
Dave Briggs says
Thank you.
The fires have been a terrible tragedy. The way people are rallying to help though is remarkable.
Antoinette Axiaq says
Hello
How about visiting ports pireaus mykonos rhodes for a hours on a cruise in mid AUGUST!!!!!!
Thanks
Dave Briggs says
Well, the problem of accommodation is solved because you are on the cruise (if I understand you correctly).
But the amount of tourists there at that time is a different matter!
Bianca says
HI Dave, I read you are an avid traveler and have travelled to the Greek islands too! We want to visit in Mid October. What will be the climatic conditions? Will it be a good time to visit especially for sight seeing?? What will be the climatic conditions in Santorini & Mykonos? Will the beaches be wet and muggy, thereby restricting sight seeing? Will the ferries that ferry passengers between Athens – Mykonos to Santorini be functional? How will the tourist season be in Athens and the Greek islands of Mykonos and Santorini? Please do advice
Dave Briggs says
Hi Bianca,
October is a great time to visit Greece for sightseeing, as the tourist crowds are definitely lessened then!
For Mykonos though, I’d ask myself what it is you want to see. Most people go for the beaches and party scene,neither of which will be rocking at that time of year.
It won’t be muggy. It would be more likely there would be occasional showers.
I visited Santorni in November, and had perfect weather for my time there!
The ferries will still run – try out ferries.gr website.
Tourist season in Santorini is now more or less all the year through.
Mykonos will end at the end of October.
Hope this is of some help. Enjoy your visit to Greece!
Chris says
Hi Dave,
Great site!
We are travelling to Athens (3 days), then on to Mykonos, Paros, Naxos, Santorini, then back to Athens in September this year 2018. Do you think we should pre-purchase our ferry tickets? All our dates are locked in, but I was thinking of just pre-purchasing the first leg Athens to Mykonos, then buying tickets at each island as we go. September appears to be a little quieter tourist wise, so is pre-purchasing needed?
Cheers,
Chris
Dave Briggs says
Hi Chris,
Hope you are well!
It sounds a nice route you have there.
Personally, I would choose to pre-book tickets if your dates are already set. At the very least, your first and last ticket.
ferryhopper.gr is an easy site to navigate that show up connections to and from islands.
Chris says
Thanks Dave – I’ll start booking … and thanks for the link.
Cheers,
Chris
Sara Pearson says
Hi – thinking of a family trip to Greece for the Christmas holiday (Dec. 21-Jan 5, 2019). I know it’s not going to be warm, but I’m wondering whether the tourist infrastructure closes down? I’m very intrigued by your ‘road trip through ancient Greece’ and wonder if December is a good time for that? Or might you have suggestions for modifying? Since we are 5 people we’d need to rent a van – are those easy to come by? Thanks in advance!
Dave Briggs says
Hi Sara,
Greece is a strange country in the winter. Most of the apartments and small hotels are physically designed for summer months meaning there is no insulation. And they can be surprisingly cold at that time of year.
However great news – Greece does have some fantastic ski resorts! And the small towns near the ski resorts are geared for people staying in them (lodges, log fires, that sort of thing!).
Here’s my take on a winter road trip in Greece-
* Archaeological sites have reduced opening hours – Most close at 15.30
* Some mountain roads may be affected by snow (if it happens to be snowing when you travel).
* You could throw in some winter sports into your itinerary – have a look at Arachova and the Parnassos Ski Centre for more inspiration. You could tie this in with a visit to Delphi.
* Tourist infrastructure is reduced considerably on the islands – but mainland Greece in the ‘important areas’ there will always be something open
* Santorini is now a year around destination – reduced services, but fewer tourists make the views more appreciable. I visited one year in November and had nice weather and quiet sunsets!
* You are going to get a better feel for ‘authentic’ Greece without the tourist crowds
* The south (Peloponnese) will be marginally warmer – Perhaps your road trip could loop up to Delphi, then to Nafpaktos (possible winter activities there), and then a loop of the Peloponnese
* Christmas is not a big thing in Greece – it would be nice to see the non-commercial side of things!
* New Year is celebrated in Athens with fireworks near the Acropolis which is fun. I would say that other major centers also have events which you could start checking. Celebrating New Year in a new country is always an experience!
Hiring a vehicle for 5 – I think you’d need to start contacting people to see what they might have available. You could also ask if there were any winter driving restrictions.
In conclusion – I personally think it would be an interesting time to visit and probably a lot of fun. What you are going to lack of course, is that beach time and sun.