Västerås climate — normals and trends
Västerås (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.3 °C and it receives 605 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 (17.3 °C on average) and the coldest is January (-3.7 °C). Rainfall peaks in August.
Västerås averages 134 frost days, 2 hot days (≥ 30 °C) and 119 rainy days per year.
Västerås 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 144 to 124 per year over the period.
The hottest day of the period reached 36.0 °C (on 7 August 1975) and the coldest -31.0 °C (on 18 January 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
VästeråsVästmanland County
- coords
- 59.62°, 16.55°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.3°C
Average daily high
9.9°C
Average daily low
2.5°C
Annual rainfall
605mm
Sunshine / day
7.4h
Mean relative humidity
78%
Average peak wind
16.0km/h
Seasonal range
21.0°C
Frost days (< 0 °C)
134 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
86.3 cm
Average feels-like high
6.9 °C
Average feels-like low
-0.8 °C
Average peak gust
34.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.23 · 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
36.0 °C
7 August 1975
Coldest day
-31.0 °C
18 January 1940
Wettest day
51 mm
29 July 2010
Windiest day
42.8 km/h
1 November 1969
Strongest gust
98.3 km/h
23 February 1992
Hottest feels-like
35.3 °C
7 August 1975
Coldest feels-like
-36.3 °C
18 January 1940
Snowiest day
15.5 cm
12 December 1999
Sunniest day
18.0 h
22 June 1940
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 | 0.9 °C | +2.3 °C | 65 mm | +25 mm |
| Feb | 1.9 °C | +2.5 °C | 15 mm | -16 mm |
| Mar | 8.3 °C | +4.6 °C | 5 mm | -25 mm |
| Apr | 13.0 °C | +3.4 °C | 27 mm | -13 mm |
| May | 14.8 °C | -1.0 °C | 59 mm | +13 mm |
| Jun | 19.8 °C | -0.2 °C | 95 mm | +33 mm |
| Jul | 24.2 °C | +2.4 °C | 130 mm | +53 mm |
| Aug | 19.9 °C | -0.5 °C | 60 mm | -17 mm |
| Sep | 18.4 °C | +2.8 °C | 65 mm | +8 mm |
| Oct | 10.7 °C | +1.0 °C | 60 mm | +9 mm |
| Nov | 4.8 °C | +1.1 °C | 41 mm | -10 mm |
| Dec | 4.4 °C | +3.9 °C | 44 mm | -0 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 Västerås?
Västerås has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.3 °C and it receives 605 mm of precipitation per year.
What is the hottest day ever recorded in Västerås?
The hottest day measured in Västerås between 1940 and 2025 was 7 August 1975, reaching 36.0 °C.
What is the coldest day in Västerås?
The coldest day measured in Västerås between 1940 and 2025 was 18 January 1940, at -31.0 °C.
Does it snow in Västerås?
Yes. Västerås gets on average 86.3 cm of snow per year and has around 134 frost days.
Has the climate of Västerås warmed?
Yes: Västerås warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Västerås?
The wettest day measured in Västerås between 1940 and 2025 was 29 July 2010, with 51 mm of rain in 24 hours.
What was the windiest day in Västerås?
The windiest day measured in Västerås between 1940 and 2025 was 1 November 1969, with winds reaching 42.8 km/h.
What is the warmest month in Västerås?
The warmest month in Västerås is July (17.3 °C on average); the coldest is January (-3.7 °C).
How much does it rain in Västerås?
Västerås receives on average 605 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in Västerås?
Västerås gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Västerås?
The heaviest 24-hour snowfall measured in Västerås between 1940 and 2025 was 12 December 1999, with 15.5 cm.
Are there tropical nights in Västerås?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Västerås.
What was the most extreme apparent temperature in Västerås?
In Västerås, between 1940 and 2025, the highest apparent temperature reached 35.3 °C on 7 August 1975, and the lowest was -36.3 °C on 18 January 1940.
Compare Västerås with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Västerås