Greece Climate

Greece has a Mediterranean climate with plenty of sunshine, mild temperatures and a limited amount of rainfall. Due to the country's geographical position, its rugged relief and its distribution between the mainland and the sea, there is great variation in Greece's climate.
In summer, the dry hot days are cooled by seasonal winds called the meltemi, while mountainous regions have generally lower temperatures.
The winters are mild in lowland areas, with a minimum amount of snow and ice, yet, mountains are usually snow-covered. Moreover, a common phenomenon is the occurrence of different climactic conditions during the same season (for instance, mild heat in coastal areas and cool temperatures in mountainous regions).
Greece's main meteorological data are given below (Source: National Meteorological Service): 
Temperature
Average temperatures (°C)
  Athens Corfu Heraklion Rhodes Santorini Thessaloniki
JAN 10,3 9,7 12,1 11,8 11,2 5,0
FEB 10,7 10,3 12,3 12,0 11,2 6,6
MAR 12,4 12,0 13,6 13,6 12,6 9,7
APR 16,0 15,0 16,6 16,6 15,5 14,2
ΜΑY 20,7 19,6 20,3 20,6 19,1 19,4
JUN 25,1 23,8 24,3 24,7 23,3 24,2
JUL 27,9 26,4 26,1 26,9 25,4 26,5
AUG 27,7 26,2 26,0 27,0 24,8 25,9
SEP 24,2 22,7 23,4 24,6 22,5 21,7
OCT 19,4 18,4 20,0 20,6 19,0 16,1
NOV 15,5 14,3 16,7 16,5 15,4 11,0
DEC 12,2 11,2 13,9 13,4 12,7 6,8
 
Rainfall-Humidity
 Relative humidity  (%)
  Athens Corfu Heraklion Rhodes Santorini Thessaloniki
JAN 68,9 74,8 68,0 70,6 71,6 75,8
FEB 68,3 74,1 66,2 69,8 70,9 73,0
MAR 68,3 73,0 66,1 69,0 72,3 72,9
APR 62,8 72,3 62,0 66,3 69,8 68,5
MAY 59,5 69,1 61,0 63,6 67,6 64,3
JUN 53,4 63,0 56,6 57,6 62,5 56,3
JUL 47,6 59,1 56,7 56,4 59,9 53,6
AUG 47,3 61,3 58,1 58,9 62,0 55,4
SEP 53,7 69,7 61,5 60,8 65,9 62,5
OCT 61,9 74,3 65,7 67,0 70,1 70,4
NOV 68,9 77,3 67,6 72,0 72,1 77,3
DEC 70,1 76,7 67,8 72,7 72,0 77,8
 
Sunshine
Average daily sunshine (in hours)
 
  Athens Heraklion Rhodes Thessaloniki
JAN 4.12' 3.48' 4.24' 3.06'
FEB 4.48' 4.18' 5.12' 3.30'
MAR 5.54' 5.42' 6.36' 4.48'
APR 7.42' 7.36' 8.00' 6.48'
MAY 9.24' 9.42' 10.00' 8.06'
JUN 11.12' 11.42' 11.42' 9.54'
JUL 11.42' 12.00' 12.06' 10.30'
AUG 11.00' 11.12' 11.30' 9.30'
SEP 9.12' 9.24' 10.06' 7.42'
OCT 6.42' 6.24' 7.48' 5.18'
NOV 5.06' 5.00' 5.54' 3.54'
DEC 3.54' 3.54' 4.30' 3.18'