Unna climate — normals and trends
Unna (Germany) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.5 °C and it receives 882 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 (17.6 °C on average) and the coldest is January (1.3 °C). Rainfall peaks in July.
Unna averages 59 frost days, 4 hot days (≥ 30 °C) and 162 rainy days per year.
Unna 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 76 to 42 per year over the period.
The hottest day of the period reached 37.4 °C (on 25 July 2019) and the coldest -24.9 °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
UnnaNorth Rhine-Westphalia
- coords
- 51.54°, 7.69°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.5°C
Average daily high
12.9°C
Average daily low
6.2°C
Annual rainfall
882mm
Sunshine / day
7.3h
Mean relative humidity
79%
Average peak wind
18.4km/h
Seasonal range
16.3°C
Frost days (< 0 °C)
59 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
162 d/yr
Annual snowfall
42.2 cm
Average feels-like high
10.3 °C
Average feels-like low
3.3 °C
Average peak gust
37.9 km/h
Tropical nights (≥ 20 °C)
1 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 = 0.45 · 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
37.4 °C
25 July 2019
Coldest day
-24.9 °C
27 January 1942
Wettest day
73 mm
14 July 2021
Windiest day
57.5 km/h
13 November 1972
Strongest gust
128.2 km/h
18 January 2007
Hottest feels-like
39.8 °C
25 July 2019
Coldest feels-like
-30.0 °C
27 January 1942
Snowiest day
14.0 cm
7 February 2021
Sunniest day
15.5 h
29 June 2019
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 | 4.9 °C | +1.5 °C | 136 mm | +61 mm |
| Feb | 6.3 °C | +1.7 °C | 26 mm | -39 mm |
| Mar | 12.7 °C | +4.1 °C | 16 mm | -54 mm |
| Apr | 16.5 °C | +3.7 °C | 77 mm | +13 mm |
| May | 19.6 °C | +2.5 °C | 42 mm | -31 mm |
| Jun | 23.9 °C | +3.9 °C | 63 mm | -15 mm |
| Jul | 24.1 °C | +2.3 °C | 77 mm | -8 mm |
| Aug | 25.1 °C | +3.5 °C | 32 mm | -48 mm |
| Sep | 19.7 °C | +1.4 °C | 70 mm | +1 mm |
| Oct | 13.3 °C | -0.2 °C | 96 mm | +30 mm |
| Nov | 9.8 °C | +1.9 °C | 67 mm | -8 mm |
| Dec | 7.4 °C | +2.8 °C | 39 mm | -42 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 Unna?
Unna has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.5 °C and it receives 882 mm of precipitation per year.
What is the hottest day ever recorded in Unna?
The hottest day measured in Unna between 1940 and 2025 was 25 July 2019, reaching 37.4 °C.
What is the coldest day in Unna?
The coldest day measured in Unna between 1940 and 2025 was 27 January 1942, at -24.9 °C.
Does it snow in Unna?
Yes. Unna gets on average 42.2 cm of snow per year and has around 59 frost days.
Has the climate of Unna warmed?
Yes: Unna warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Unna?
The wettest day measured in Unna between 1940 and 2025 was 14 July 2021, with 73 mm of rain in 24 hours.
What was the windiest day in Unna?
The windiest day measured in Unna between 1940 and 2025 was 13 November 1972, with winds reaching 57.5 km/h.
What is the warmest month in Unna?
The warmest month in Unna is July (17.6 °C on average); the coldest is January (1.3 °C).
How much does it rain in Unna?
Unna receives on average 882 mm of precipitation per year, spread over about 162 rainy days.
Is it sunny in Unna?
Unna 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 Unna?
The heaviest 24-hour snowfall measured in Unna between 1940 and 2025 was 7 February 2021, with 14.0 cm.
Are there tropical nights in Unna?
Yes: Unna has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Unna?
In Unna, between 1940 and 2025, the highest apparent temperature reached 39.8 °C on 25 July 2019, and the lowest was -30.0 °C on 27 January 1942.
Compare Unna with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Unna