Greece has a warm Mediterranean climate. 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.
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.
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Relative humidity (%)

By City	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
Iraklio	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 average per day (in hours)

By City

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'

Iraklio

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'

Average temperatures (°C)

By City	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
Iraklio	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.

By Period	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

Note: Data from Olympic Airways Site