Originally Posted by
Andy33
For Santorini the time of your visit isn't low season, it is out of season altogether. You're unlikely to find any tourist facilities open unless they also serve the winter population, about 15,000 people. The main objectives of the winter transport services are to move people to and from Athens - you'll be lucky to find more than one or two ferries a week Santorini to Crete, and that's in a normal week with no public holidays.
Two small corrections: a) there will be both hotels and restaurants (not many, of course) that are open and b) there are NO ferries between Santorini and Crete in the winter.
As it's the middle of the winter, storms can cause delay or cancellation.
And also ruin your vacation (although they're sort of fun...).
In Crete and Athens you'll have no problems finding hotels and restaurants open all year round, as there are business travellers, and for the same reason services like car hire will be available. Athens does get several heavy snowfalls each winter, so you might even see the Acropolis in the snow.
"Several" means a couple.
All in all, Greece is just beautiful in the winter, not crowded and very, very green.