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Greece's climate information and data

Greece has a warm Mediterranean climate. Summers in the lowlands, are hot and dry with clear skies. Dry hot days are often relieved by a system of seasonal breezes. The mountain areas are much cooler, with considerable rain. Winters are mild in the lowlands with rare frost and snow, but the mountains are usually covered with snow.

Rain & Humidity

Rainfall varies greatly from region to region. It rains mostly from October to March. Rainfall is rare from June to August, and days are dry and sunny, which is usual for a Mediterranean climate.

 

Relative humidity (%)
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Athens 68.9 68.3 66.3 62.8 59.5 53.4 47.6 47.3 53.7 61.9 68.9 70.1
Corfu 74.8 74.1 73.0 72.3 69.1 63.0 59.1 61.3 69.7 74.3 77.3 76.7
Heraklion 68.0 66.2 66.1 62.0 61.0 56.6 56.7 58.1 61.5 65.7 67.6 67.8
Rhodes 70.6 69.8 69.0 66.3 63.6 57.6 56.4 58.9 60.8 67.0 72.0 72.7
Santorini 71.6 70.9 72.3 69.8 67.6 62.5 59.9 62.0 65.9 70.1 72.1 72.0
Thessaloniki 75.8 73.0 72.9 68.5 64.3 56.3 53.6 55.4 62.5 70.4 77.3 77.8

Sunshine

 

Sunshine average per day (in hours)

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Athens 4.12' 4.48' 5.54' 7.42' 9.24' 11.12' 11.42' 11.00' 9.12' 6.42' 5.06' 3.54'
Heraklion 3.48' 4.18' 5.42' 7.36' 9.42' 11.42' 12.00' 11.12' 9.24' 6.24' 5.00' 3.54'
Rhodes 4.24' 5.12' 6.36' 8.00' 10.00' 11.42' 12.06' 11.30' 10.06' 7.48' 5.54' 4.30'
Thessaloniki 3.06' 3.30' 4.48' 6.48' 8.06' 9.54' 10.30' 9.30' 7.42' 5.18' 3.54' 3.18'

Temperatures

 

Average temperatures (C)
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
Athens 10.3 10.7 12.4 16.0 20.7 25.1 27.9 27.7 24.2 19.4 15.5 12.2
Corfu 9.7 10.3 12.0 15.0 19.6 23.8 26.4 26.2 22.7 18.4 14.3 11.2
Heraklion 12.1 12.3 13.6 16.6 20.3 24.3 26.1 26.0 23.4 20.0 16.7 13.9
Rhodes 11.8 12.0 13.6 16.6 20.6 24.7 26.9 27.0 24.6 20.6 16.5 13.4
Santorini 11.2 11.2 12.6 15.5 19.1 23.3 25.4 24.8 22.5 19.0 15.4 12.7
Thessaloniki 5.0 6.6 9.7 14.2 19.4 24.2 26.5 25.9 21.7 16.1 11.0 6.8

Winds in the Aegean Sea (from April to October)

During the summer months and especially between mid July and mid August, strong winds are common in the Aegean Sea. These winds are called "Meltemi" and blow from North/Northeast. "Meltemi" starts suddenly and can blow continuously for several days.

  North Aegean Middle Aegean South Aegean
APRIL-MAY N to NW 4 N NW 5-6 N NW 5-6
JUNE-mid JULY NW N NE 4-5 NW 4-6 NW W 5-7
mid JULY-AUGUST N NE 5
(6 in "Meltemi")
N NE 5
(6-7 in "Meltemi")
N NW 5
(7-8 in "Meltemi")
SEPT.-OCT. N NE 3-5
S SE 5-6
N 3- 5-6
S SE 5-6
N 3- 5-6
E SE 4-7