Bålsta climate — normals and trends
Bålsta (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 572 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 (17.5 °C on average) and the coldest is January (-3.7 °C). Rainfall peaks in August.
Bålsta averages 135 frost days, 2 hot days (≥ 30 °C) and 118 rainy days per year.
Bålsta has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 147 to 123 per year over the period.
The hottest day of the period reached 36.0 °C (on 21 July 2022) and the coldest -31.9 °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
BålstaUppsala County
- coords
- 59.57°, 17.53°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.3°C
Average daily high
10.0°C
Average daily low
2.5°C
Annual rainfall
572mm
Sunshine / day
7.4h
Mean relative humidity
78%
Average peak wind
16.3km/h
Seasonal range
21.2°C
Frost days (< 0 °C)
135 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
118 d/yr
Annual snowfall
80.4 cm
Average feels-like high
6.9 °C
Average feels-like low
-0.8 °C
Average peak gust
34.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.27 · 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
21 July 2022
Coldest day
-31.9 °C
18 January 1940
Wettest day
50 mm
9 July 1945
Windiest day
46.2 km/h
2 November 1969
Strongest gust
101.9 km/h
22 February 2020
Hottest feels-like
35.0 °C
7 August 1975
Coldest feels-like
-37.2 °C
18 January 1940
Snowiest day
17.6 cm
28 April 1995
Sunniest day
18.0 h
2 July 1956
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 | 1.2 °C | +2.6 °C | 62 mm | +24 mm |
| Feb | 1.6 °C | +2.3 °C | 8 mm | -21 mm |
| Mar | 8.3 °C | +4.8 °C | 6 mm | -23 mm |
| Apr | 12.7 °C | +3.2 °C | 20 mm | -17 mm |
| May | 14.7 °C | -1.1 °C | 35 mm | -9 mm |
| Jun | 20.1 °C | -0.1 °C | 75 mm | +16 mm |
| Jul | 24.6 °C | +2.5 °C | 96 mm | +23 mm |
| Aug | 20.1 °C | -0.5 °C | 69 mm | -4 mm |
| Sep | 18.5 °C | +2.8 °C | 65 mm | +12 mm |
| Oct | 10.9 °C | +1.1 °C | 53 mm | +5 mm |
| Nov | 5.0 °C | +1.2 °C | 31 mm | -16 mm |
| Dec | 4.6 °C | +4.1 °C | 39 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 Bålsta?
Bålsta has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.3 °C and it receives 572 mm of precipitation per year.
What is the hottest day ever recorded in Bålsta?
The hottest day measured in Bålsta between 1940 and 2025 was 21 July 2022, reaching 36.0 °C.
What is the coldest day in Bålsta?
The coldest day measured in Bålsta between 1940 and 2025 was 18 January 1940, at -31.9 °C.
Does it snow in Bålsta?
Yes. Bålsta gets on average 80.4 cm of snow per year and has around 135 frost days.
Has the climate of Bålsta warmed?
Yes: Bålsta warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bålsta?
The wettest day measured in Bålsta between 1940 and 2025 was 9 July 1945, with 50 mm of rain in 24 hours.
What was the windiest day in Bålsta?
The windiest day measured in Bålsta between 1940 and 2025 was 2 November 1969, with winds reaching 46.2 km/h.
What is the warmest month in Bålsta?
The warmest month in Bålsta is July (17.5 °C on average); the coldest is January (-3.7 °C).
How much does it rain in Bålsta?
Bålsta receives on average 572 mm of precipitation per year, spread over about 118 rainy days.
Is it sunny in Bålsta?
Bålsta 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 Bålsta?
The heaviest 24-hour snowfall measured in Bålsta between 1940 and 2025 was 28 April 1995, with 17.6 cm.
Are there tropical nights in Bålsta?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Bålsta.
What was the most extreme apparent temperature in Bålsta?
In Bålsta, between 1940 and 2025, the highest apparent temperature reached 35.0 °C on 7 August 1975, and the lowest was -37.2 °C on 18 January 1940.
Compare Bålsta with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bålsta