Hallstahammar climate — normals and trends
Hallstahammar (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.2 °C and it receives 612 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 July.
Hallstahammar averages 133 frost days, 1 hot days (≥ 30 °C) and 119 rainy days per year.
Hallstahammar has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 144 to 122 per year over the period.
The hottest day of the period reached 35.7 °C (on 7 August 1975) and the coldest -30.4 °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
HallstahammarVästmanland County
- coords
- 59.61°, 16.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.2°C
Average daily high
9.9°C
Average daily low
2.5°C
Annual rainfall
612mm
Sunshine / day
7.4h
Mean relative humidity
78%
Average peak wind
15.8km/h
Seasonal range
21.0°C
Frost days (< 0 °C)
133 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
88.6 cm
Average feels-like high
6.9 °C
Average feels-like low
-0.7 °C
Average peak gust
34.7 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
+1.7 °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
35.7 °C
7 August 1975
Coldest day
-30.4 °C
18 January 1940
Wettest day
53 mm
1 September 1978
Windiest day
41.8 km/h
22 February 2020
Strongest gust
99.4 km/h
23 February 1992
Hottest feels-like
35.2 °C
7 August 1975
Coldest feels-like
-35.6 °C
18 January 1940
Snowiest day
15.3 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 | 66 mm | +26 mm |
| Feb | 2.0 °C | +2.7 °C | 17 mm | -14 mm |
| Mar | 8.3 °C | +4.6 °C | 5 mm | -25 mm |
| Apr | 13.1 °C | +3.5 °C | 28 mm | -12 mm |
| May | 14.9 °C | -0.8 °C | 59 mm | +13 mm |
| Jun | 19.7 °C | -0.2 °C | 94 mm | +31 mm |
| Jul | 24.2 °C | +2.5 °C | 128 mm | +51 mm |
| Aug | 19.8 °C | -0.6 °C | 63 mm | -14 mm |
| Sep | 18.3 °C | +2.7 °C | 62 mm | +5 mm |
| Oct | 10.7 °C | +1.1 °C | 63 mm | +11 mm |
| Nov | 4.8 °C | +1.1 °C | 42 mm | -11 mm |
| Dec | 4.4 °C | +4.0 °C | 44 mm | -1 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 Hallstahammar?
Hallstahammar has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.2 °C and it receives 612 mm of precipitation per year.
What is the hottest day ever recorded in Hallstahammar?
The hottest day measured in Hallstahammar between 1940 and 2025 was 7 August 1975, reaching 35.7 °C.
What is the coldest day in Hallstahammar?
The coldest day measured in Hallstahammar between 1940 and 2025 was 18 January 1940, at -30.4 °C.
Does it snow in Hallstahammar?
Yes. Hallstahammar gets on average 88.6 cm of snow per year and has around 133 frost days.
Has the climate of Hallstahammar warmed?
Yes: Hallstahammar warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hallstahammar?
The wettest day measured in Hallstahammar between 1940 and 2025 was 1 September 1978, with 53 mm of rain in 24 hours.
What was the windiest day in Hallstahammar?
The windiest day measured in Hallstahammar between 1940 and 2025 was 22 February 2020, with winds reaching 41.8 km/h.
What is the warmest month in Hallstahammar?
The warmest month in Hallstahammar is July (17.3 °C on average); the coldest is January (-3.7 °C).
How much does it rain in Hallstahammar?
Hallstahammar receives on average 612 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in Hallstahammar?
Hallstahammar 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 Hallstahammar?
The heaviest 24-hour snowfall measured in Hallstahammar between 1940 and 2025 was 12 December 1999, with 15.3 cm.
Are there tropical nights in Hallstahammar?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Hallstahammar.
What was the most extreme apparent temperature in Hallstahammar?
In Hallstahammar, between 1940 and 2025, the highest apparent temperature reached 35.2 °C on 7 August 1975, and the lowest was -35.6 °C on 18 January 1940.
Compare Hallstahammar with another city
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Nearby cities
The climate around Hallstahammar