Koszalin climate — normals and trends
Koszalin (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.2 °C and it receives 720 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 July (17.5 °C on average) and the coldest is January (-0.7 °C). Rainfall peaks in July.
Koszalin averages 78 frost days, 1 hot days (≥ 30 °C) and 145 rainy days per year.
Koszalin has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 102 to 54 per year over the period.
The hottest day of the period reached 35.3 °C (on 10 August 1992) and the coldest -27.1 °C (on 25 January 1942).
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
KoszalinWest Pomerania
- coords
- 54.19°, 16.17°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.2°C
Average daily high
11.1°C
Average daily low
5.4°C
Annual rainfall
720mm
Sunshine / day
7.8h
Mean relative humidity
81%
Average peak wind
22.5km/h
Seasonal range
18.2°C
Frost days (< 0 °C)
78 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
53.6 cm
Average feels-like high
8.1 °C
Average feels-like low
1.8 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.45 · 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
35.3 °C
10 August 1992
Coldest day
-27.1 °C
25 January 1942
Wettest day
112 mm
24 July 2010
Windiest day
65.2 km/h
2 November 1981
Strongest gust
117.7 km/h
18 January 1983
Hottest feels-like
36.6 °C
16 July 2007
Coldest feels-like
-32.8 °C
1 February 1956
Snowiest day
16.5 cm
1 May 1985
Sunniest day
16.0 h
4 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 4.3 °C | +3.2 °C | 92 mm | +39 mm |
| Feb | 3.2 °C | +1.4 °C | 21 mm | -23 mm |
| Mar | 9.4 °C | +4.1 °C | 13 mm | -33 mm |
| Apr | 13.4 °C | +3.1 °C | 16 mm | -28 mm |
| May | 14.0 °C | -1.2 °C | 52 mm | -3 mm |
| Jun | 19.8 °C | +1.1 °C | 78 mm | +12 mm |
| Jul | 21.6 °C | +0.9 °C | 99 mm | +11 mm |
| Aug | 21.5 °C | +0.7 °C | 43 mm | -35 mm |
| Sep | 19.7 °C | +2.5 °C | 51 mm | -19 mm |
| Oct | 12.4 °C | +0.2 °C | 100 mm | +40 mm |
| Nov | 7.2 °C | +0.8 °C | 48 mm | -11 mm |
| Dec | 5.3 °C | +2.4 °C | 21 mm | -36 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 Koszalin?
Koszalin has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.2 °C and it receives 720 mm of precipitation per year.
What is the hottest day ever recorded in Koszalin?
The hottest day measured in Koszalin between 1940 and 2025 was 10 August 1992, reaching 35.3 °C.
What is the coldest day in Koszalin?
The coldest day measured in Koszalin between 1940 and 2025 was 25 January 1942, at -27.1 °C.
Does it snow in Koszalin?
Yes. Koszalin gets on average 53.6 cm of snow per year and has around 78 frost days.
Has the climate of Koszalin warmed?
Yes: Koszalin warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Koszalin?
The wettest day measured in Koszalin between 1940 and 2025 was 24 July 2010, with 112 mm of rain in 24 hours.
What was the windiest day in Koszalin?
The windiest day measured in Koszalin between 1940 and 2025 was 2 November 1981, with winds reaching 65.2 km/h.
What is the warmest month in Koszalin?
The warmest month in Koszalin is July (17.5 °C on average); the coldest is January (-0.7 °C).
How much does it rain in Koszalin?
Koszalin receives on average 720 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Koszalin?
Koszalin gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.
What is the biggest single-day snowfall in Koszalin?
The heaviest 24-hour snowfall measured in Koszalin between 1940 and 2025 was 1 May 1985, with 16.5 cm.
Are there tropical nights in Koszalin?
Yes: Koszalin has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Koszalin?
In Koszalin, between 1940 and 2025, the highest apparent temperature reached 36.6 °C on 16 July 2007, and the lowest was -32.8 °C on 1 February 1956.
Compare Koszalin with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Koszalin