Greece lies in the Mediterranean climate zone. The summers are warm to hot and dry. In midsummer, where not infrequently the 40 degrees are exceeded, there are long dry seasons in many regions. Since it often does not rain at all, the forest fire danger rises.
Winter is mild and rainy on the coasts. In the mountainous interior, snow is not uncommon in the winter months. Well-known ski resorts with well prepared slopes are on Mount Olympus, in Parnassos and at Kalavryta in the Peloponnese.
The rainiest months are from November to March with coastal temperatures usually not falling below freezing. Often, they are also significantly higher in winter.
The best travel time for active visitors to Greece (for example for sightseeing tours and hikes) are April / May and from mid-September to November. The temperatures are very pleasant, but it is not too hot for outdoor activities. If you just want to relax on the beach, from mid-June to mid-September high temperatures and the sea has been heated to pleasant bathing temperatures. At this time, constant sunshine is almost guaranteed.