Grassau climate — normals and trends
Grassau (Germany) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.8 °C and it receives 1,646 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 (16.3 °C on average) and the coldest is January (-3.3 °C). Rainfall peaks in July.
Grassau averages 135 frost days, 2 hot days (≥ 30 °C) and 192 rainy days per year.
Grassau has warmed by +3.1 °C between 1940 and 2025, or +0.36 °C per decade. This trend is statistically significant.
The number of frost days there went from about 164 to 106 per year over the period.
The hottest day of the period reached 34.7 °C (on 28 July 2013) and the coldest -27.6 °C (on 23 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
GrassauBavaria
- coords
- 47.78°, 12.45°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.8°C
Average daily high
11.2°C
Average daily low
2.7°C
Annual rainfall
1,646mm
Sunshine / day
8.3h
Mean relative humidity
81%
Average peak wind
9.5km/h
Seasonal range
19.6°C
Frost days (< 0 °C)
135 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
192 d/yr
Annual snowfall
265.1 cm
Average feels-like high
9.5 °C
Average feels-like low
0.1 °C
Average peak gust
31.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.65 · 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
34.7 °C
28 July 2013
Coldest day
-27.6 °C
23 January 1942
Wettest day
97 mm
6 August 1985
Windiest day
31.6 km/h
29 October 2017
Strongest gust
124.2 km/h
1 March 2008
Hottest feels-like
37.4 °C
27 July 1983
Coldest feels-like
-32.4 °C
23 January 1942
Snowiest day
29.8 cm
20 January 1951
Sunniest day
15.3 h
22 June 2025
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 | 3.4 °C | +3.2 °C | 65 mm | -34 mm |
| Feb | 4.7 °C | +2.2 °C | 35 mm | -59 mm |
| Mar | 10.5 °C | +3.8 °C | 134 mm | +20 mm |
| Apr | 15.3 °C | +4.2 °C | 54 mm | -67 mm |
| May | 15.8 °C | -0.3 °C | 169 mm | -2 mm |
| Jun | 24.4 °C | +5.1 °C | 117 mm | -90 mm |
| Jul | 20.9 °C | -0.2 °C | 308 mm | +101 mm |
| Aug | 22.9 °C | +2.1 °C | 150 mm | -36 mm |
| Sep | 18.3 °C | +0.9 °C | 110 mm | -27 mm |
| Oct | 12.0 °C | -0.6 °C | 110 mm | +7 mm |
| Nov | 7.4 °C | +1.8 °C | 110 mm | +9 mm |
| Dec | 4.5 °C | +3.4 °C | 31 mm | -74 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 Grassau?
Grassau has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.8 °C and it receives 1,646 mm of precipitation per year.
What is the hottest day ever recorded in Grassau?
The hottest day measured in Grassau between 1940 and 2025 was 28 July 2013, reaching 34.7 °C.
What is the coldest day in Grassau?
The coldest day measured in Grassau between 1940 and 2025 was 23 January 1942, at -27.6 °C.
Does it snow in Grassau?
Yes. Grassau gets on average 265.1 cm of snow per year and has around 135 frost days.
Has the climate of Grassau warmed?
Yes: Grassau warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grassau?
The wettest day measured in Grassau between 1940 and 2025 was 6 August 1985, with 97 mm of rain in 24 hours.
What was the windiest day in Grassau?
The windiest day measured in Grassau between 1940 and 2025 was 29 October 2017, with winds reaching 31.6 km/h.
What is the warmest month in Grassau?
The warmest month in Grassau is July (16.3 °C on average); the coldest is January (-3.3 °C).
How much does it rain in Grassau?
Grassau receives on average 1,646 mm of precipitation per year, spread over about 192 rainy days.
Is it sunny in Grassau?
Grassau gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grassau?
The heaviest 24-hour snowfall measured in Grassau between 1940 and 2025 was 20 January 1951, with 29.8 cm.
Are there tropical nights in Grassau?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Grassau.
What was the most extreme apparent temperature in Grassau?
In Grassau, between 1940 and 2025, the highest apparent temperature reached 37.4 °C on 27 July 1983, and the lowest was -32.4 °C on 23 January 1942.
Compare Grassau with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grassau