The Massif Central is an elevated area located in the southern part of central France. It is has a semi-land climate, where winters are cold, spring begins early, and has a very warm summer once it reaches its zenith.
The climate in Greece is in the summer : warm and muggy in the winter: cold and gross in the spring: cool in the fall: cool and nasty in the mountains is also quite cold and the climate of Greece is regulated by the mediterranean sea
That depends on where you live. But they can be planted in early spring if your climate is warm or late spring/early summer if you climate is colder. Where I live (southern hemisphere) I plant tomatoes in early September (spring).