Ermoupoli climate — normals and trends
Ermoupoli (Greece) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.7 °C and it receives 378 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 (24.4 °C on average) and the coldest is January (12.0 °C). Rainfall peaks in January.
Ermoupoli averages 0 frost days, 0 hot days (≥ 30 °C) and 58 rainy days per year.
Ermoupoli has warmed by +0.9 °C between 1940 and 2025, or +0.11 °C per decade. This trend is statistically significant.
The hottest day of the period reached 29.7 °C (on 28 June 2007) and the coldest 2.0 °C (on 14 January 1968).
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
ErmoupoliSouth Aegean
- coords
- 37.44°, 24.94°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.7°C
Average daily high
18.6°C
Average daily low
17.0°C
Annual rainfall
378mm
Sunshine / day
10.6h
Mean relative humidity
76%
Average peak wind
34.1km/h
Seasonal range
12.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
58 d/yr
Annual snowfall
0.5 cm
Average feels-like high
17.2 °C
Average feels-like low
13.7 °C
Average peak gust
46.0 km/h
Tropical nights (≥ 20 °C)
124 d/yr
Solar radiation
18.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.9 °C
since 1940
+0.1 °C per decade · r² = 0.24 · 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
29.7 °C
28 June 2007
Coldest day
2.0 °C
14 January 1968
Wettest day
101 mm
22 October 1976
Windiest day
78.3 km/h
22 January 2004
Strongest gust
127.1 km/h
22 January 2004
Hottest feels-like
36.8 °C
26 June 2007
Coldest feels-like
-8.8 °C
8 February 1976
Snowiest day
12.3 cm
14 January 1968
Sunniest day
14.3 h
24 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 | 15.5 °C | +2.5 °C | 20 mm | -58 mm |
| Feb | 12.2 °C | -0.9 °C | 42 mm | -13 mm |
| Mar | 15.5 °C | +1.6 °C | 37 mm | -9 mm |
| Apr | 16.2 °C | +0.2 °C | 48 mm | +29 mm |
| May | 19.3 °C | +0.3 °C | 6 mm | -3 mm |
| Jun | 23.1 °C | +0.3 °C | 0 mm | -2 mm |
| Jul | 26.2 °C | +1.3 °C | 0 mm | -1 mm |
| Aug | 25.8 °C | +0.6 °C | 0 mm | -1 mm |
| Sep | 23.9 °C | +0.6 °C | 6 mm | +1 mm |
| Oct | 20.7 °C | +0.5 °C | 99 mm | +63 mm |
| Nov | 19.5 °C | +2.3 °C | 18 mm | -32 mm |
| Dec | 16.1 °C | +1.6 °C | 68 mm | -8 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 Ermoupoli?
Ermoupoli has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.7 °C and it receives 378 mm of precipitation per year.
What is the hottest day ever recorded in Ermoupoli?
The hottest day measured in Ermoupoli between 1940 and 2025 was 28 June 2007, reaching 29.7 °C.
What is the coldest day in Ermoupoli?
The coldest day measured in Ermoupoli between 1940 and 2025 was 14 January 1968, at 2.0 °C.
Does it snow in Ermoupoli?
Almost never: Ermoupoli sees virtually no snow, with about 0 frost days per year.
Has the climate of Ermoupoli warmed?
Yes: Ermoupoli warmed by +0.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ermoupoli?
The wettest day measured in Ermoupoli between 1940 and 2025 was 22 October 1976, with 101 mm of rain in 24 hours.
What was the windiest day in Ermoupoli?
The windiest day measured in Ermoupoli between 1940 and 2025 was 22 January 2004, with winds reaching 78.3 km/h.
What is the warmest month in Ermoupoli?
The warmest month in Ermoupoli is August (24.4 °C on average); the coldest is January (12.0 °C).
How much does it rain in Ermoupoli?
Ermoupoli receives on average 378 mm of precipitation per year, spread over about 58 rainy days.
Is it sunny in Ermoupoli?
Ermoupoli gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ermoupoli?
The heaviest 24-hour snowfall measured in Ermoupoli between 1940 and 2025 was 14 January 1968, with 12.3 cm.
Are there tropical nights in Ermoupoli?
Yes: Ermoupoli has on average 124 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ermoupoli?
In Ermoupoli, between 1940 and 2025, the highest apparent temperature reached 36.8 °C on 26 June 2007, and the lowest was -8.8 °C on 8 February 1976.
Compare Ermoupoli with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ermoupoli