Sławno climate — normals and trends
Sławno (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.8 °C and it receives 758 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 (-1.5 °C). Rainfall peaks in July.
Sławno averages 94 frost days, 1 hot days (≥ 30 °C) and 148 rainy days per year.
Sławno 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 116 to 72 per year over the period.
The hottest day of the period reached 35.4 °C (on 10 August 1992) and the coldest -30.5 °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
SławnoWest Pomerania
- coords
- 54.36°, 16.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.8°C
Average daily high
11.0°C
Average daily low
4.5°C
Annual rainfall
758mm
Sunshine / day
7.4h
Mean relative humidity
82%
Average peak wind
20.5km/h
Seasonal range
18.7°C
Frost days (< 0 °C)
94 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
148 d/yr
Annual snowfall
63.5 cm
Average feels-like high
8.1 °C
Average feels-like low
1.1 °C
Average peak gust
39.5 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 = 0.43 · 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
35.4 °C
10 August 1992
Coldest day
-30.5 °C
25 January 1942
Wettest day
84 mm
24 July 2010
Windiest day
63.2 km/h
2 November 1981
Strongest gust
123.1 km/h
18 January 1983
Hottest feels-like
37.5 °C
16 July 2007
Coldest feels-like
-35.9 °C
25 January 1942
Snowiest day
17.5 cm
4 April 1970
Sunniest day
16.0 h
21 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 | 3.8 °C | +3.3 °C | 95 mm | +42 mm |
| Feb | 2.7 °C | +1.3 °C | 23 mm | -23 mm |
| Mar | 9.9 °C | +4.6 °C | 15 mm | -34 mm |
| Apr | 14.2 °C | +3.4 °C | 21 mm | -29 mm |
| May | 14.3 °C | -1.6 °C | 64 mm | 0 mm |
| Jun | 20.0 °C | +0.8 °C | 100 mm | +24 mm |
| Jul | 21.8 °C | +0.9 °C | 103 mm | +5 mm |
| Aug | 21.3 °C | +0.4 °C | 59 mm | -25 mm |
| Sep | 19.6 °C | +2.5 °C | 55 mm | -15 mm |
| Oct | 12.0 °C | +0.1 °C | 93 mm | +35 mm |
| Nov | 6.6 °C | +0.7 °C | 41 mm | -15 mm |
| Dec | 4.8 °C | +2.5 °C | 19 mm | -38 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 Sławno?
Sławno has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.8 °C and it receives 758 mm of precipitation per year.
What is the hottest day ever recorded in Sławno?
The hottest day measured in Sławno between 1940 and 2025 was 10 August 1992, reaching 35.4 °C.
What is the coldest day in Sławno?
The coldest day measured in Sławno between 1940 and 2025 was 25 January 1942, at -30.5 °C.
Does it snow in Sławno?
Yes. Sławno gets on average 63.5 cm of snow per year and has around 94 frost days.
Has the climate of Sławno warmed?
Yes: Sławno warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sławno?
The wettest day measured in Sławno between 1940 and 2025 was 24 July 2010, with 84 mm of rain in 24 hours.
What was the windiest day in Sławno?
The windiest day measured in Sławno between 1940 and 2025 was 2 November 1981, with winds reaching 63.2 km/h.
What is the warmest month in Sławno?
The warmest month in Sławno is July (17.2 °C on average); the coldest is January (-1.5 °C).
How much does it rain in Sławno?
Sławno receives on average 758 mm of precipitation per year, spread over about 148 rainy days.
Is it sunny in Sławno?
Sławno gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sławno?
The heaviest 24-hour snowfall measured in Sławno between 1940 and 2025 was 4 April 1970, with 17.5 cm.
Are there tropical nights in Sławno?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sławno.
What was the most extreme apparent temperature in Sławno?
In Sławno, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 16 July 2007, and the lowest was -35.9 °C on 25 January 1942.
Compare Sławno with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sławno