Kollum climate — normals and trends
Kollum (The Netherlands) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.4 °C and it receives 740 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 August (16.8 °C on average) and the coldest is January (2.2 °C). Rainfall peaks in July.
Kollum averages 50 frost days, 1 hot days (≥ 30 °C) and 148 rainy days per year.
Kollum has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 65 to 35 per year over the period.
The hottest day of the period reached 35.2 °C (on 24 July 2019) and the coldest -24.1 °C (on 13 February 1940).
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
KollumFriesland
- coords
- 53.28°, 6.15°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.4°C
Average daily high
12.4°C
Average daily low
6.4°C
Annual rainfall
740mm
Sunshine / day
7.9h
Mean relative humidity
82%
Average peak wind
22.6km/h
Seasonal range
14.6°C
Frost days (< 0 °C)
50 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
148 d/yr
Annual snowfall
20.2 cm
Average feels-like high
9.6 °C
Average feels-like low
3.2 °C
Average peak gust
41.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
35.2 °C
24 July 2019
Coldest day
-24.1 °C
13 February 1940
Wettest day
45 mm
7 July 1994
Windiest day
69.2 km/h
26 January 1990
Strongest gust
133.6 km/h
23 February 1967
Hottest feels-like
38.1 °C
25 July 2019
Coldest feels-like
-29.2 °C
13 February 1940
Snowiest day
15.5 cm
25 February 1958
Sunniest day
16.3 h
24 June 2020
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 | 5.6 °C | +1.5 °C | 53 mm | -4 mm |
| Feb | 5.7 °C | +0.9 °C | 30 mm | -16 mm |
| Mar | 11.7 °C | +3.7 °C | 10 mm | -40 mm |
| Apr | 14.4 °C | +2.7 °C | 49 mm | -0 mm |
| May | 16.7 °C | +1.0 °C | 37 mm | -24 mm |
| Jun | 20.8 °C | +2.4 °C | 89 mm | +22 mm |
| Jul | 22.0 °C | +1.8 °C | 104 mm | +22 mm |
| Aug | 22.2 °C | +1.7 °C | 42 mm | -37 mm |
| Sep | 18.9 °C | +1.2 °C | 66 mm | +2 mm |
| Oct | 14.0 °C | +0.5 °C | 100 mm | +39 mm |
| Nov | 9.6 °C | +1.1 °C | 83 mm | +20 mm |
| Dec | 8.0 °C | +2.5 °C | 29 mm | -32 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 Kollum?
Kollum has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.4 °C and it receives 740 mm of precipitation per year.
What is the hottest day ever recorded in Kollum?
The hottest day measured in Kollum between 1940 and 2025 was 24 July 2019, reaching 35.2 °C.
What is the coldest day in Kollum?
The coldest day measured in Kollum between 1940 and 2025 was 13 February 1940, at -24.1 °C.
Does it snow in Kollum?
Yes. Kollum gets on average 20.2 cm of snow per year and has around 50 frost days.
Has the climate of Kollum warmed?
Yes: Kollum warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kollum?
The wettest day measured in Kollum between 1940 and 2025 was 7 July 1994, with 45 mm of rain in 24 hours.
What was the windiest day in Kollum?
The windiest day measured in Kollum between 1940 and 2025 was 26 January 1990, with winds reaching 69.2 km/h.
What is the warmest month in Kollum?
The warmest month in Kollum is August (16.8 °C on average); the coldest is January (2.2 °C).
How much does it rain in Kollum?
Kollum receives on average 740 mm of precipitation per year, spread over about 148 rainy days.
Is it sunny in Kollum?
Kollum gets on average 7.9 hours of sunshine per day, roughly 2,884 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kollum?
The heaviest 24-hour snowfall measured in Kollum between 1940 and 2025 was 25 February 1958, with 15.5 cm.
Are there tropical nights in Kollum?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Kollum.
What was the most extreme apparent temperature in Kollum?
In Kollum, between 1940 and 2025, the highest apparent temperature reached 38.1 °C on 25 July 2019, and the lowest was -29.2 °C on 13 February 1940.
Compare Kollum with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kollum