Ølstykke climate — normals and trends
Ølstykke (Denmark) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.2 °C and it receives 640 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 (17.0 °C on average) and the coldest is January (0.0 °C). Rainfall peaks in July.
Ølstykke averages 80 frost days, 0 hot days (≥ 30 °C) and 131 rainy days per year.
Ølstykke has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 102 to 58 per year over the period.
The hottest day of the period reached 33.2 °C (on 9 August 1975) and the coldest -25.2 °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
ØlstykkeCapital Region
- coords
- 55.80°, 12.16°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.2°C
Average daily high
11.2°C
Average daily low
5.1°C
Annual rainfall
640mm
Sunshine / day
7.6h
Mean relative humidity
81%
Average peak wind
22.3km/h
Seasonal range
17.0°C
Frost days (< 0 °C)
80 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
48.6 cm
Average feels-like high
8.0 °C
Average feels-like low
1.6 °C
Average peak gust
41.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.38 · 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
33.2 °C
9 August 1975
Coldest day
-25.2 °C
26 January 1942
Wettest day
62 mm
22 September 1967
Windiest day
68.1 km/h
8 January 2005
Strongest gust
122.8 km/h
28 October 2013
Hottest feels-like
34.4 °C
10 August 1975
Coldest feels-like
-30.9 °C
26 January 1942
Snowiest day
17.6 cm
10 April 1970
Sunniest day
16.6 h
1 July 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 | 4.5 °C | +2.6 °C | 55 mm | +8 mm |
| Feb | 3.5 °C | +1.3 °C | 13 mm | -25 mm |
| Mar | 9.6 °C | +4.2 °C | 22 mm | -19 mm |
| Apr | 13.7 °C | +3.4 °C | 12 mm | -30 mm |
| May | 15.6 °C | +0.3 °C | 43 mm | -9 mm |
| Jun | 19.6 °C | +0.8 °C | 90 mm | +26 mm |
| Jul | 22.1 °C | +1.4 °C | 136 mm | +63 mm |
| Aug | 21.0 °C | +0.6 °C | 48 mm | -25 mm |
| Sep | 18.9 °C | +2.1 °C | 64 mm | +7 mm |
| Oct | 12.7 °C | +0.8 °C | 88 mm | +36 mm |
| Nov | 7.6 °C | +0.9 °C | 38 mm | -12 mm |
| Dec | 6.4 °C | +2.8 °C | 25 mm | -26 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 Ølstykke?
Ølstykke has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 8.2 °C and it receives 640 mm of precipitation per year.
What is the hottest day ever recorded in Ølstykke?
The hottest day measured in Ølstykke between 1940 and 2025 was 9 August 1975, reaching 33.2 °C.
What is the coldest day in Ølstykke?
The coldest day measured in Ølstykke between 1940 and 2025 was 26 January 1942, at -25.2 °C.
Does it snow in Ølstykke?
Yes. Ølstykke gets on average 48.6 cm of snow per year and has around 80 frost days.
Has the climate of Ølstykke warmed?
Yes: Ølstykke warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ølstykke?
The wettest day measured in Ølstykke between 1940 and 2025 was 22 September 1967, with 62 mm of rain in 24 hours.
What was the windiest day in Ølstykke?
The windiest day measured in Ølstykke between 1940 and 2025 was 8 January 2005, with winds reaching 68.1 km/h.
What is the warmest month in Ølstykke?
The warmest month in Ølstykke is July (17.0 °C on average); the coldest is January (0.0 °C).
How much does it rain in Ølstykke?
Ølstykke receives on average 640 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Ølstykke?
Ølstykke 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 Ølstykke?
The heaviest 24-hour snowfall measured in Ølstykke between 1940 and 2025 was 10 April 1970, with 17.6 cm.
Are there tropical nights in Ølstykke?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ølstykke.
What was the most extreme apparent temperature in Ølstykke?
In Ølstykke, between 1940 and 2025, the highest apparent temperature reached 34.4 °C on 10 August 1975, and the lowest was -30.9 °C on 26 January 1942.
Compare Ølstykke with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ølstykke