Santorini, sometimes called Thera or Thira, is located in the southern Aegean Sea within the Cyclades group of Islands. It is really the remnant of a volcanic caldera.
Santorini depends upon collected rain water and a recently built desalination plant for drinking water. Santorini, along with Anafi, also in the Cycladic island chain, are the only places in Europe named to have a desert climate. What water falls in Santorini falls around the colder months, centered around winter.
Santorini is known for its wine. Vines are planted in such a way as to derive their moisture from dew.
There really isn't a bad time to be in Santorini, as far as the weather is concerned. The Maximum average temperature in January is a 57 degrees farenheit. The rains subside in April, so April, May, and September are the most ideal months of low rainfall and reasonable temperatures.
Summers are warm and dry, and it's the time tourists hit the beaches, many of them named for the colors of the sand, which come from the volcanic activity in the area.
The climate charts below show the historic high and low temperatures and average monthly rainfall for Santorini, Greece.
Aroma Suites (Fira)
Blue Dolphins Apartments (Firostefani)
Anemi House & Villas (Oia)