Slagelse climate — normals and trends
Slagelse (Denmark) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.5 °C and it receives 667 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 (16.9 °C on average) and the coldest is February (0.8 °C). Rainfall peaks in August.
Slagelse averages 54 frost days, 0 hot days (≥ 30 °C) and 133 rainy days per year.
Slagelse 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 78 to 30 per year over the period.
The hottest day of the period reached 28.9 °C (on 11 August 1975) and the coldest -18.5 °C (on 26 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
SlagelseZealand
- coords
- 55.40°, 11.35°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.5°C
Average daily high
10.5°C
Average daily low
6.6°C
Annual rainfall
667mm
Sunshine / day
8.1h
Mean relative humidity
82%
Average peak wind
26.9km/h
Seasonal range
16.1°C
Frost days (< 0 °C)
54 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
43.3 cm
Average feels-like high
7.0 °C
Average feels-like low
2.4 °C
Average peak gust
41.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.49 · 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
28.9 °C
11 August 1975
Coldest day
-18.5 °C
26 January 1942
Wettest day
56 mm
21 July 1980
Windiest day
79.1 km/h
8 January 2005
Strongest gust
125.6 km/h
28 October 2013
Hottest feels-like
30.6 °C
10 August 1975
Coldest feels-like
-27.1 °C
25 January 1942
Snowiest day
18.0 cm
10 April 1970
Sunniest day
16.9 h
27 June 2018
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 | 4.5 °C | +2.3 °C | 66 mm | +11 mm |
| Feb | 3.2 °C | +1.0 °C | 14 mm | -29 mm |
| Mar | 8.1 °C | +3.5 °C | 18 mm | -25 mm |
| Apr | 12.1 °C | +3.5 °C | 23 mm | -17 mm |
| May | 14.5 °C | +1.0 °C | 36 mm | -14 mm |
| Jun | 18.5 °C | +1.1 °C | 69 mm | +11 mm |
| Jul | 20.8 °C | +1.4 °C | 146 mm | +77 mm |
| Aug | 19.9 °C | +0.5 °C | 34 mm | -35 mm |
| Sep | 18.0 °C | +1.8 °C | 61 mm | +2 mm |
| Oct | 12.6 °C | +1.3 °C | 99 mm | +37 mm |
| Nov | 8.0 °C | +1.2 °C | 49 mm | -11 mm |
| Dec | 6.5 °C | +2.6 °C | 37 mm | -22 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 Slagelse?
Slagelse has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 8.5 °C and it receives 667 mm of precipitation per year.
What is the hottest day ever recorded in Slagelse?
The hottest day measured in Slagelse between 1940 and 2025 was 11 August 1975, reaching 28.9 °C.
What is the coldest day in Slagelse?
The coldest day measured in Slagelse between 1940 and 2025 was 26 January 1942, at -18.5 °C.
Does it snow in Slagelse?
Yes. Slagelse gets on average 43.3 cm of snow per year and has around 54 frost days.
Has the climate of Slagelse warmed?
Yes: Slagelse warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Slagelse?
The wettest day measured in Slagelse between 1940 and 2025 was 21 July 1980, with 56 mm of rain in 24 hours.
What was the windiest day in Slagelse?
The windiest day measured in Slagelse between 1940 and 2025 was 8 January 2005, with winds reaching 79.1 km/h.
What is the warmest month in Slagelse?
The warmest month in Slagelse is July (16.9 °C on average); the coldest is February (0.8 °C).
How much does it rain in Slagelse?
Slagelse receives on average 667 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Slagelse?
Slagelse gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Slagelse?
The heaviest 24-hour snowfall measured in Slagelse between 1940 and 2025 was 10 April 1970, with 18.0 cm.
Are there tropical nights in Slagelse?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Slagelse.
What was the most extreme apparent temperature in Slagelse?
In Slagelse, between 1940 and 2025, the highest apparent temperature reached 30.6 °C on 10 August 1975, and the lowest was -27.1 °C on 25 January 1942.
Compare Slagelse with another city
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Nearby cities
The climate around Slagelse