Trollhättan climate — normals and trends
Trollhättan (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.1 °C and it receives 771 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 (16.7 °C on average) and the coldest is February (-1.9 °C). Rainfall peaks in August.
Trollhättan averages 101 frost days, 0 hot days (≥ 30 °C) and 136 rainy days per year.
Trollhättan has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 117 to 85 per year over the period.
The hottest day of the period reached 33.5 °C (on 13 July 1941) and the coldest -27.7 °C (on 11 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
TrollhättanVästra Götaland County
- coords
- 58.28°, 12.29°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.1°C
Average daily high
10.1°C
Average daily low
4.0°C
Annual rainfall
771mm
Sunshine / day
7.8h
Mean relative humidity
81%
Average peak wind
17.6km/h
Seasonal range
18.6°C
Frost days (< 0 °C)
101 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
136 d/yr
Annual snowfall
78.5 cm
Average feels-like high
7.3 °C
Average feels-like low
0.8 °C
Average peak gust
38.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.25 · 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
33.5 °C
13 July 1941
Coldest day
-27.7 °C
11 February 1956
Wettest day
42 mm
12 July 2023
Windiest day
51.1 km/h
22 February 2008
Strongest gust
116.6 km/h
14 January 2007
Hottest feels-like
35.0 °C
8 August 1975
Coldest feels-like
-32.9 °C
28 January 1942
Snowiest day
21.9 cm
4 April 1998
Sunniest day
17.5 h
22 June 2014
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 | 3.1 °C | +2.9 °C | 104 mm | +47 mm |
| Feb | 2.6 °C | +2.1 °C | 28 mm | -15 mm |
| Mar | 8.0 °C | +3.7 °C | 21 mm | -21 mm |
| Apr | 13.3 °C | +3.7 °C | 27 mm | -22 mm |
| May | 14.8 °C | -0.4 °C | 42 mm | -17 mm |
| Jun | 18.5 °C | -0.2 °C | 72 mm | -2 mm |
| Jul | 23.2 °C | +2.8 °C | 73 mm | -12 mm |
| Aug | 19.9 °C | +0.3 °C | 56 mm | -33 mm |
| Sep | 17.6 °C | +2.0 °C | 94 mm | +18 mm |
| Oct | 11.4 °C | +0.9 °C | 76 mm | +3 mm |
| Nov | 6.1 °C | +1.0 °C | 63 mm | -3 mm |
| Dec | 5.2 °C | +3.2 °C | 64 mm | +3 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 Trollhättan?
Trollhättan has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.1 °C and it receives 771 mm of precipitation per year.
What is the hottest day ever recorded in Trollhättan?
The hottest day measured in Trollhättan between 1940 and 2025 was 13 July 1941, reaching 33.5 °C.
What is the coldest day in Trollhättan?
The coldest day measured in Trollhättan between 1940 and 2025 was 11 February 1956, at -27.7 °C.
Does it snow in Trollhättan?
Yes. Trollhättan gets on average 78.5 cm of snow per year and has around 101 frost days.
Has the climate of Trollhättan warmed?
Yes: Trollhättan warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Trollhättan?
The wettest day measured in Trollhättan between 1940 and 2025 was 12 July 2023, with 42 mm of rain in 24 hours.
What was the windiest day in Trollhättan?
The windiest day measured in Trollhättan between 1940 and 2025 was 22 February 2008, with winds reaching 51.1 km/h.
What is the warmest month in Trollhättan?
The warmest month in Trollhättan is July (16.7 °C on average); the coldest is February (-1.9 °C).
How much does it rain in Trollhättan?
Trollhättan receives on average 771 mm of precipitation per year, spread over about 136 rainy days.
Is it sunny in Trollhättan?
Trollhättan gets on average 7.8 hours of sunshine per day, roughly 2,847 hours per year over 1940-2025.
What is the biggest single-day snowfall in Trollhättan?
The heaviest 24-hour snowfall measured in Trollhättan between 1940 and 2025 was 4 April 1998, with 21.9 cm.
Are there tropical nights in Trollhättan?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Trollhättan.
What was the most extreme apparent temperature in Trollhättan?
In Trollhättan, between 1940 and 2025, the highest apparent temperature reached 35.0 °C on 8 August 1975, and the lowest was -32.9 °C on 28 January 1942.
Compare Trollhättan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Trollhättan