Słupsk climate — normals and trends
Słupsk (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.0 °C and it receives 778 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 (17.2 °C on average) and the coldest is January (-0.6 °C). Rainfall peaks in July.
Słupsk averages 72 frost days, 0 hot days (≥ 30 °C) and 151 rainy days per year.
Słupsk has warmed by +2.4 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 96 to 48 per year over the period.
The hottest day of the period reached 31.8 °C (on 4 August 1943) and the coldest -24.4 °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
SłupskPomerania
- coords
- 54.46°, 17.03°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.0°C
Average daily high
10.3°C
Average daily low
5.7°C
Annual rainfall
778mm
Sunshine / day
7.6h
Mean relative humidity
81%
Average peak wind
24.3km/h
Seasonal range
17.8°C
Frost days (< 0 °C)
72 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
151 d/yr
Annual snowfall
61.0 cm
Average feels-like high
7.2 °C
Average feels-like low
1.9 °C
Average peak gust
39.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.47 · 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
31.8 °C
4 August 1943
Coldest day
-24.4 °C
25 January 1942
Wettest day
82 mm
24 July 2010
Windiest day
72.1 km/h
2 November 1981
Strongest gust
125.3 km/h
18 January 1983
Hottest feels-like
34.2 °C
1 August 2018
Coldest feels-like
-31.0 °C
1 February 1956
Snowiest day
18.2 cm
4 April 1970
Sunniest day
16.0 h
29 June 2024
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 | 4.2 °C | +3.2 °C | 99 mm | +42 mm |
| Feb | 2.7 °C | +1.3 °C | 23 mm | -24 mm |
| Mar | 8.2 °C | +3.8 °C | 13 mm | -34 mm |
| Apr | 11.9 °C | +3.0 °C | 23 mm | -21 mm |
| May | 12.7 °C | -0.9 °C | 56 mm | +1 mm |
| Jun | 18.3 °C | +1.0 °C | 91 mm | +28 mm |
| Jul | 20.8 °C | +1.0 °C | 85 mm | -4 mm |
| Aug | 20.3 °C | +0.3 °C | 61 mm | -24 mm |
| Sep | 19.0 °C | +2.4 °C | 53 mm | -29 mm |
| Oct | 12.1 °C | +0.4 °C | 109 mm | +37 mm |
| Nov | 7.2 °C | +0.9 °C | 51 mm | -20 mm |
| Dec | 5.3 °C | +2.4 °C | 19 mm | -47 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 Słupsk?
Słupsk has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.0 °C and it receives 778 mm of precipitation per year.
What is the hottest day ever recorded in Słupsk?
The hottest day measured in Słupsk between 1940 and 2025 was 4 August 1943, reaching 31.8 °C.
What is the coldest day in Słupsk?
The coldest day measured in Słupsk between 1940 and 2025 was 25 January 1942, at -24.4 °C.
Does it snow in Słupsk?
Yes. Słupsk gets on average 61.0 cm of snow per year and has around 72 frost days.
Has the climate of Słupsk warmed?
Yes: Słupsk warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Słupsk?
The wettest day measured in Słupsk between 1940 and 2025 was 24 July 2010, with 82 mm of rain in 24 hours.
What was the windiest day in Słupsk?
The windiest day measured in Słupsk between 1940 and 2025 was 2 November 1981, with winds reaching 72.1 km/h.
What is the warmest month in Słupsk?
The warmest month in Słupsk is July (17.2 °C on average); the coldest is January (-0.6 °C).
How much does it rain in Słupsk?
Słupsk receives on average 778 mm of precipitation per year, spread over about 151 rainy days.
Is it sunny in Słupsk?
Słupsk gets on average 7.6 hours of sunshine per day, roughly 2,774 hours per year over 1940-2025.
What is the biggest single-day snowfall in Słupsk?
The heaviest 24-hour snowfall measured in Słupsk between 1940 and 2025 was 4 April 1970, with 18.2 cm.
Are there tropical nights in Słupsk?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Słupsk.
What was the most extreme apparent temperature in Słupsk?
In Słupsk, between 1940 and 2025, the highest apparent temperature reached 34.2 °C on 1 August 2018, and the lowest was -31.0 °C on 1 February 1956.
Compare Słupsk with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Słupsk