We're in the mid-negative-20's range, closer to -30 at night...and I'll have to say that I will take that in preference to your conditions. Cold is cold; you dress for it and you're okay. But that temperature hovering just at, or just under or just over the freezing mark always results in thawing/freezing/thawing/freezing and makes for some really dangerous driving conditions.
Why Greece in the summer...instead of in the depths of winter? Whenever you go, it sounds great!
Exactly, I'd take a very crisp -20°C anytime over the, as you say, hovering on the edge type temps, where you get the unpleasant freeze/thaw type situation. Mind you, I've never experienced what -20°C feels like, lol.
Greece at this time of year is, weather wise, very pleasant. Regular daily temps of around 20°C. Summer daytime temps, when we go, remain mid 30's °C.
The problem is, if we decided to take a winter break to Greece we'd struggle to get a flight to the island (Zakynthos). And even if we did manage to get a flight we'd unlikely get digs out there. And even if we did get digs there'd be nowhere open to buy provisions and such. And all the tavernas would be shut so we couldn't go for a lovely evening meal or anything.
The thing is, a lot of the popular Mediterranean holiday resorts, which are predominantly the Spanish and Greek isles, all close down during the off season period.
Flights stop going to the resorts and the shutters come down on all the bars and restaurants. The once bustling holiday resorts become ghost towns. Not all Mediterranean destinations are like that, some remain popular all year round, Tenerife for example (Spanish), is a very popular destination for the Christmas period.
The island we go to, Zakynthos or Zante, same thing, is an island which basically shuts up shop to holiday makers. If you go on Google maps and look it up you'll see how tiny it is.