Glessen climate — normals and trends
Glessen (Germany) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.3 °C and it receives 763 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 (18.5 °C on average) and the coldest is January (2.2 °C). Rainfall peaks in December.
Glessen averages 50 frost days, 6 hot days (≥ 30 °C) and 148 rainy days per year.
Glessen 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 65 to 35 per year over the period.
The hottest day of the period reached 40.7 °C (on 25 July 2019) and the coldest -22.5 °C (on 2 February 1956).
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
GlessenNorth Rhine-Westphalia
- coords
- 50.97°, 6.75°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.3°C
Average daily high
13.8°C
Average daily low
6.9°C
Annual rainfall
763mm
Sunshine / day
7.6h
Mean relative humidity
77%
Average peak wind
17.8km/h
Seasonal range
16.3°C
Frost days (< 0 °C)
50 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
148 d/yr
Annual snowfall
24.0 cm
Average feels-like high
11.4 °C
Average feels-like low
4.2 °C
Average peak gust
35.7 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
10.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.46 · 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
40.7 °C
25 July 2019
Coldest day
-22.5 °C
2 February 1956
Wettest day
89 mm
14 July 2021
Windiest day
56.5 km/h
24 November 1984
Strongest gust
121.0 km/h
18 January 2007
Hottest feels-like
40.7 °C
25 July 2019
Coldest feels-like
-28.0 °C
2 February 1956
Snowiest day
11.5 cm
1 February 1953
Sunniest day
15.4 h
26 June 2010
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 | 5.7 °C | +1.3 °C | 130 mm | +64 mm |
| Feb | 7.0 °C | +1.2 °C | 29 mm | -29 mm |
| Mar | 13.5 °C | +3.8 °C | 10 mm | -50 mm |
| Apr | 17.2 °C | +3.5 °C | 74 mm | +20 mm |
| May | 20.4 °C | +2.5 °C | 50 mm | -11 mm |
| Jun | 25.0 °C | +4.1 °C | 54 mm | -11 mm |
| Jul | 25.3 °C | +2.5 °C | 75 mm | +7 mm |
| Aug | 25.9 °C | +3.3 °C | 38 mm | -27 mm |
| Sep | 20.2 °C | +1.0 °C | 101 mm | +42 mm |
| Oct | 14.2 °C | -0.2 °C | 81 mm | +19 mm |
| Nov | 10.7 °C | +2.0 °C | 72 mm | +2 mm |
| Dec | 8.1 °C | +2.5 °C | 42 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 Glessen?
Glessen has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.3 °C and it receives 763 mm of precipitation per year.
What is the hottest day ever recorded in Glessen?
The hottest day measured in Glessen between 1940 and 2025 was 25 July 2019, reaching 40.7 °C.
What is the coldest day in Glessen?
The coldest day measured in Glessen between 1940 and 2025 was 2 February 1956, at -22.5 °C.
Does it snow in Glessen?
Yes. Glessen gets on average 24.0 cm of snow per year and has around 50 frost days.
Has the climate of Glessen warmed?
Yes: Glessen warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Glessen?
The wettest day measured in Glessen between 1940 and 2025 was 14 July 2021, with 89 mm of rain in 24 hours.
What was the windiest day in Glessen?
The windiest day measured in Glessen between 1940 and 2025 was 24 November 1984, with winds reaching 56.5 km/h.
What is the warmest month in Glessen?
The warmest month in Glessen is July (18.5 °C on average); the coldest is January (2.2 °C).
How much does it rain in Glessen?
Glessen receives on average 763 mm of precipitation per year, spread over about 148 rainy days.
Is it sunny in Glessen?
Glessen 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 Glessen?
The heaviest 24-hour snowfall measured in Glessen between 1940 and 2025 was 1 February 1953, with 11.5 cm.
Are there tropical nights in Glessen?
Yes: Glessen has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Glessen?
In Glessen, between 1940 and 2025, the highest apparent temperature reached 40.7 °C on 25 July 2019, and the lowest was -28.0 °C on 2 February 1956.
Compare Glessen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Glessen