Lerum climate — normals and trends
Lerum (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 866 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 (16.4 °C on average) and the coldest is February (-1.8 °C). Rainfall peaks in August.
Lerum averages 102 frost days, 0 hot days (≥ 30 °C) and 147 rainy days per year.
Lerum 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 118 to 86 per year over the period.
The hottest day of the period reached 32.9 °C (on 9 August 1975) and the coldest -27.4 °C (on 28 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
LerumVästra Götaland County
- coords
- 57.77°, 12.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.1°C
Average daily high
10.2°C
Average daily low
3.9°C
Annual rainfall
866mm
Sunshine / day
7.7h
Mean relative humidity
82%
Average peak wind
17.4km/h
Seasonal range
18.2°C
Frost days (< 0 °C)
102 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
147 d/yr
Annual snowfall
79.4 cm
Average feels-like high
7.3 °C
Average feels-like low
0.7 °C
Average peak gust
38.8 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 = 0.26 · 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
32.9 °C
9 August 1975
Coldest day
-27.4 °C
28 January 1942
Wettest day
45 mm
4 August 2008
Windiest day
56.5 km/h
8 January 2005
Strongest gust
125.6 km/h
22 September 1969
Hottest feels-like
34.7 °C
7 August 1975
Coldest feels-like
-33.6 °C
28 January 1942
Snowiest day
17.4 cm
4 April 1998
Sunniest day
17.2 h
30 June 2018
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 | 3.3 °C | +2.9 °C | 100 mm | +34 mm |
| Feb | 2.6 °C | +1.8 °C | 30 mm | -19 mm |
| Mar | 8.3 °C | +3.9 °C | 24 mm | -24 mm |
| Apr | 13.4 °C | +3.7 °C | 26 mm | -28 mm |
| May | 14.5 °C | -0.8 °C | 53 mm | -11 mm |
| Jun | 18.0 °C | -0.5 °C | 85 mm | +5 mm |
| Jul | 22.7 °C | +2.5 °C | 104 mm | +10 mm |
| Aug | 19.7 °C | +0.2 °C | 54 mm | -48 mm |
| Sep | 17.4 °C | +1.8 °C | 109 mm | +21 mm |
| Oct | 11.5 °C | +1.0 °C | 83 mm | +1 mm |
| Nov | 6.1 °C | +0.8 °C | 65 mm | -6 mm |
| Dec | 5.1 °C | +2.9 °C | 67 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 Lerum?
Lerum has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.1 °C and it receives 866 mm of precipitation per year.
What is the hottest day ever recorded in Lerum?
The hottest day measured in Lerum between 1940 and 2025 was 9 August 1975, reaching 32.9 °C.
What is the coldest day in Lerum?
The coldest day measured in Lerum between 1940 and 2025 was 28 January 1942, at -27.4 °C.
Does it snow in Lerum?
Yes. Lerum gets on average 79.4 cm of snow per year and has around 102 frost days.
Has the climate of Lerum warmed?
Yes: Lerum warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lerum?
The wettest day measured in Lerum between 1940 and 2025 was 4 August 2008, with 45 mm of rain in 24 hours.
What was the windiest day in Lerum?
The windiest day measured in Lerum between 1940 and 2025 was 8 January 2005, with winds reaching 56.5 km/h.
What is the warmest month in Lerum?
The warmest month in Lerum is July (16.4 °C on average); the coldest is February (-1.8 °C).
How much does it rain in Lerum?
Lerum receives on average 866 mm of precipitation per year, spread over about 147 rainy days.
Is it sunny in Lerum?
Lerum gets on average 7.7 hours of sunshine per day, roughly 2,811 hours per year over 1940-2025.
What is the biggest single-day snowfall in Lerum?
The heaviest 24-hour snowfall measured in Lerum between 1940 and 2025 was 4 April 1998, with 17.4 cm.
Are there tropical nights in Lerum?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Lerum.
What was the most extreme apparent temperature in Lerum?
In Lerum, between 1940 and 2025, the highest apparent temperature reached 34.7 °C on 7 August 1975, and the lowest was -33.6 °C on 28 January 1942.
Compare Lerum with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Lerum