Greece's climate varies according to region.
The southern and central portions of the country experience the traditional Mediterranean climate of hot, dry summers and mild, wet winters. The continental climate of northern Greece is marked by colder winters.
There is also considerable regional variation in annual rainfall, with areas to the west of the Pindus Mountains receiving far more rain than those to the east.

The Ionian island of Corfu, located off the mainland's north-western coast, receives an average of 1,000 mm (40 in) of rain per year,
whereas the average annual rainfall in Athens in central Greece is 400 mm (16 in).

Snow is common in the mountains. The average January temperature in Athens is 10° C /50° F the July average is 28° C/ 82° F.

The climate in Santorini  is deceptive. It's similar to the Bay Area in California, mildly hot during the day, cooler at night.  The climate is mild and dry. During the summer temperature is between 25- 35 degrees.