Sundern climate — normals and trends
Sundern (Germany) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.0 °C and it receives 1,055 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 (16.1 °C on average) and the coldest is January (-0.4 °C). Rainfall peaks in July.
Sundern averages 80 frost days, 1 hot days (≥ 30 °C) and 177 rainy days per year.
Sundern has warmed by +2.2 °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 100 to 60 per year over the period.
The hottest day of the period reached 35.3 °C (on 25 July 2019) and the coldest -24.3 °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
SundernNorth Rhine-Westphalia
- coords
- 51.33°, 8.00°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.0°C
Average daily high
11.2°C
Average daily low
4.9°C
Annual rainfall
1,055mm
Sunshine / day
7.3h
Mean relative humidity
83%
Average peak wind
18.2km/h
Seasonal range
16.5°C
Frost days (< 0 °C)
80 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
177 d/yr
Annual snowfall
97.6 cm
Average feels-like high
8.5 °C
Average feels-like low
1.7 °C
Average peak gust
39.8 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 = 0.43 · 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
35.3 °C
25 July 2019
Coldest day
-24.3 °C
13 February 1940
Wettest day
81 mm
14 July 2021
Windiest day
55.1 km/h
18 January 2007
Strongest gust
134.6 km/h
24 November 1984
Hottest feels-like
37.5 °C
25 July 2019
Coldest feels-like
-29.5 °C
13 February 1940
Snowiest day
22.5 cm
27 November 1949
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 | 3.0 °C | +1.4 °C | 161 mm | +67 mm |
| Feb | 4.7 °C | +1.9 °C | 34 mm | -46 mm |
| Mar | 11.3 °C | +4.5 °C | 27 mm | -56 mm |
| Apr | 15.1 °C | +3.9 °C | 98 mm | +20 mm |
| May | 17.9 °C | +2.4 °C | 62 mm | -28 mm |
| Jun | 22.4 °C | +3.9 °C | 76 mm | -20 mm |
| Jul | 22.3 °C | +2.1 °C | 98 mm | -4 mm |
| Aug | 23.4 °C | +3.4 °C | 42 mm | -54 mm |
| Sep | 18.1 °C | +1.5 °C | 72 mm | -8 mm |
| Oct | 11.5 °C | -0.3 °C | 108 mm | +33 mm |
| Nov | 7.9 °C | +1.7 °C | 58 mm | -28 mm |
| Dec | 5.9 °C | +3.0 °C | 36 mm | -61 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 Sundern?
Sundern has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.0 °C and it receives 1,055 mm of precipitation per year.
What is the hottest day ever recorded in Sundern?
The hottest day measured in Sundern between 1940 and 2025 was 25 July 2019, reaching 35.3 °C.
What is the coldest day in Sundern?
The coldest day measured in Sundern between 1940 and 2025 was 13 February 1940, at -24.3 °C.
Does it snow in Sundern?
Yes. Sundern gets on average 97.6 cm of snow per year and has around 80 frost days.
Has the climate of Sundern warmed?
Yes: Sundern warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sundern?
The wettest day measured in Sundern between 1940 and 2025 was 14 July 2021, with 81 mm of rain in 24 hours.
What was the windiest day in Sundern?
The windiest day measured in Sundern between 1940 and 2025 was 18 January 2007, with winds reaching 55.1 km/h.
What is the warmest month in Sundern?
The warmest month in Sundern is July (16.1 °C on average); the coldest is January (-0.4 °C).
How much does it rain in Sundern?
Sundern receives on average 1,055 mm of precipitation per year, spread over about 177 rainy days.
Is it sunny in Sundern?
Sundern 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 Sundern?
The heaviest 24-hour snowfall measured in Sundern between 1940 and 2025 was 27 November 1949, with 22.5 cm.
Are there tropical nights in Sundern?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sundern.
What was the most extreme apparent temperature in Sundern?
In Sundern, between 1940 and 2025, the highest apparent temperature reached 37.5 °C on 25 July 2019, and the lowest was -29.5 °C on 13 February 1940.
Compare Sundern with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sundern