Kalymnos climate — normals and trends
Kalymnos (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 18.3 °C and it receives 704 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (24.7 °C on average) and the coldest is February (12.8 °C). Rainfall peaks in December.
Kalymnos averages 0 frost days, 0 hot days (≥ 30 °C) and 71 rainy days per year.
Kalymnos has warmed by +1.0 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The hottest day of the period reached 30.2 °C (on 24 August 2007) and the coldest 1.4 °C (on 9 February 1976).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
KalymnosSouth Aegean
- coords
- 36.95°, 26.98°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.3°C
Average daily high
19.3°C
Average daily low
17.5°C
Annual rainfall
704mm
Sunshine / day
11.0h
Mean relative humidity
74%
Average peak wind
34.2km/h
Seasonal range
11.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
71 d/yr
Annual snowfall
0.1 cm
Average feels-like high
18.0 °C
Average feels-like low
14.6 °C
Average peak gust
46.6 km/h
Tropical nights (≥ 20 °C)
136 d/yr
Solar radiation
18.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.25 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
30.2 °C
24 August 2007
Coldest day
1.4 °C
9 February 1976
Wettest day
89 mm
25 November 1960
Windiest day
78.6 km/h
6 February 2012
Strongest gust
133.9 km/h
22 January 2004
Hottest feels-like
36.1 °C
11 August 2025
Coldest feels-like
-10.2 °C
9 February 1976
Snowiest day
1.4 cm
9 February 1976
Sunniest day
14.1 h
27 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 16.7 °C | +2.6 °C | 93 mm | -58 mm |
| Feb | 12.8 °C | -1.2 °C | 96 mm | -12 mm |
| Mar | 16.5 °C | +1.8 °C | 32 mm | -37 mm |
| Apr | 17.1 °C | +0.4 °C | 41 mm | +13 mm |
| May | 19.9 °C | +0.3 °C | 8 mm | -4 mm |
| Jun | 24.7 °C | +1.6 °C | 0 mm | -2 mm |
| Jul | 26.5 °C | +1.3 °C | 0 mm | -0 mm |
| Aug | 26.9 °C | +1.1 °C | 0 mm | -1 mm |
| Sep | 24.9 °C | +1.0 °C | 0 mm | -9 mm |
| Oct | 21.4 °C | +0.2 °C | 54 mm | +2 mm |
| Nov | 20.5 °C | +2.2 °C | 75 mm | -27 mm |
| Dec | 17.2 °C | +1.6 °C | 190 mm | +20 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Kalymnos?
Kalymnos has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 18.3 °C and it receives 704 mm of precipitation per year.
What is the hottest day ever recorded in Kalymnos?
The hottest day measured in Kalymnos between 1940 and 2025 was 24 August 2007, reaching 30.2 °C.
What is the coldest day in Kalymnos?
The coldest day measured in Kalymnos between 1940 and 2025 was 9 February 1976, at 1.4 °C.
Does it snow in Kalymnos?
Almost never: Kalymnos sees virtually no snow, with about 0 frost days per year.
Has the climate of Kalymnos warmed?
Yes: Kalymnos warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kalymnos?
The wettest day measured in Kalymnos between 1940 and 2025 was 25 November 1960, with 89 mm of rain in 24 hours.
What was the windiest day in Kalymnos?
The windiest day measured in Kalymnos between 1940 and 2025 was 6 February 2012, with winds reaching 78.6 km/h.
What is the warmest month in Kalymnos?
The warmest month in Kalymnos is August (24.7 °C on average); the coldest is February (12.8 °C).
How much does it rain in Kalymnos?
Kalymnos receives on average 704 mm of precipitation per year, spread over about 71 rainy days.
Is it sunny in Kalymnos?
Kalymnos gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kalymnos?
The heaviest 24-hour snowfall measured in Kalymnos between 1940 and 2025 was 9 February 1976, with 1.4 cm.
Are there tropical nights in Kalymnos?
Yes: Kalymnos has on average 136 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kalymnos?
In Kalymnos, between 1940 and 2025, the highest apparent temperature reached 36.1 °C on 11 August 2025, and the lowest was -10.2 °C on 9 February 1976.
Compare Kalymnos with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kalymnos