Harsum climate — normals and trends
Harsum (Germany) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.2 °C and it receives 707 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 (17.8 °C on average) and the coldest is January (0.7 °C). Rainfall peaks in July.
Harsum averages 65 frost days, 4 hot days (≥ 30 °C) and 145 rainy days per year.
Harsum has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The number of frost days there went from about 82 to 48 per year over the period.
The hottest day of the period reached 38.6 °C (on 20 July 2022) and the coldest -27.4 °C (on 27 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
HarsumLower Saxony
- coords
- 52.21°, 9.96°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.2°C
Average daily high
12.7°C
Average daily low
5.9°C
Annual rainfall
707mm
Sunshine / day
7.3h
Mean relative humidity
78%
Average peak wind
17.8km/h
Seasonal range
17.1°C
Frost days (< 0 °C)
65 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
39.7 cm
Average feels-like high
10.1 °C
Average feels-like low
2.9 °C
Average peak gust
37.1 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
+2.2 °C
since 1940
+0.3 °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
38.6 °C
20 July 2022
Coldest day
-27.4 °C
27 January 1942
Wettest day
58 mm
12 August 1964
Windiest day
62.5 km/h
13 November 1972
Strongest gust
136.8 km/h
13 November 1972
Hottest feels-like
39.1 °C
4 July 2015
Coldest feels-like
-33.1 °C
27 January 1942
Snowiest day
18.2 cm
2 January 1987
Sunniest day
15.9 h
21 June 2025
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 | 4.7 °C | +2.0 °C | 84 mm | +29 mm |
| Feb | 4.9 °C | +1.0 °C | 21 mm | -27 mm |
| Mar | 12.3 °C | +4.4 °C | 9 mm | -44 mm |
| Apr | 16.4 °C | +3.7 °C | 38 mm | -15 mm |
| May | 19.2 °C | +2.0 °C | 42 mm | -22 mm |
| Jun | 23.4 °C | +3.1 °C | 66 mm | -3 mm |
| Jul | 23.7 °C | +1.6 °C | 69 mm | -5 mm |
| Aug | 24.9 °C | +2.9 °C | 39 mm | -30 mm |
| Sep | 20.4 °C | +2.0 °C | 47 mm | -8 mm |
| Oct | 13.4 °C | +0.1 °C | 66 mm | +14 mm |
| Nov | 8.8 °C | +1.4 °C | 55 mm | -2 mm |
| Dec | 6.7 °C | +2.7 °C | 26 mm | -35 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 Harsum?
Harsum has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.2 °C and it receives 707 mm of precipitation per year.
What is the hottest day ever recorded in Harsum?
The hottest day measured in Harsum between 1940 and 2025 was 20 July 2022, reaching 38.6 °C.
What is the coldest day in Harsum?
The coldest day measured in Harsum between 1940 and 2025 was 27 January 1942, at -27.4 °C.
Does it snow in Harsum?
Yes. Harsum gets on average 39.7 cm of snow per year and has around 65 frost days.
Has the climate of Harsum warmed?
Yes: Harsum warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Harsum?
The wettest day measured in Harsum between 1940 and 2025 was 12 August 1964, with 58 mm of rain in 24 hours.
What was the windiest day in Harsum?
The windiest day measured in Harsum between 1940 and 2025 was 13 November 1972, with winds reaching 62.5 km/h.
What is the warmest month in Harsum?
The warmest month in Harsum is July (17.8 °C on average); the coldest is January (0.7 °C).
How much does it rain in Harsum?
Harsum receives on average 707 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Harsum?
Harsum gets on average 7.3 hours of sunshine per day, roughly 2,665 hours per year over 1940-2025.
What is the biggest single-day snowfall in Harsum?
The heaviest 24-hour snowfall measured in Harsum between 1940 and 2025 was 2 January 1987, with 18.2 cm.
Are there tropical nights in Harsum?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Harsum.
What was the most extreme apparent temperature in Harsum?
In Harsum, between 1940 and 2025, the highest apparent temperature reached 39.1 °C on 4 July 2015, and the lowest was -33.1 °C on 27 January 1942.
Compare Harsum with another city
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Nearby cities
The climate around Harsum