Oskarshamn climate — normals and trends
Oskarshamn (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.6 °C and it receives 535 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 (17.6 °C on average) and the coldest is February (-1.2 °C). Rainfall peaks in July.
Oskarshamn averages 97 frost days, 1 hot days (≥ 30 °C) and 115 rainy days per year.
Oskarshamn 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 110 to 84 per year over the period.
The hottest day of the period reached 33.7 °C (on 21 July 2022) and the coldest -24.3 °C (on 27 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
OskarshamnKalmar
- coords
- 57.26°, 16.45°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.6°C
Average daily high
10.8°C
Average daily low
4.4°C
Annual rainfall
535mm
Sunshine / day
7.8h
Mean relative humidity
78%
Average peak wind
19.3km/h
Seasonal range
18.8°C
Frost days (< 0 °C)
97 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
115 d/yr
Annual snowfall
70.1 cm
Average feels-like high
7.7 °C
Average feels-like low
0.9 °C
Average peak gust
40.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.28 · 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
33.7 °C
21 July 2022
Coldest day
-24.3 °C
27 January 1942
Wettest day
54 mm
31 August 2018
Windiest day
56.9 km/h
8 January 2005
Strongest gust
114.8 km/h
8 January 2005
Hottest feels-like
34.1 °C
7 August 1975
Coldest feels-like
-29.9 °C
27 January 1942
Snowiest day
21.3 cm
4 April 1998
Sunniest day
17.1 h
14 June 2025
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 | 3.9 °C | +3.0 °C | 70 mm | +31 mm |
| Feb | 2.8 °C | +1.6 °C | 8 mm | -25 mm |
| Mar | 9.0 °C | +4.5 °C | 12 mm | -19 mm |
| Apr | 13.4 °C | +3.9 °C | 9 mm | -25 mm |
| May | 14.9 °C | 0.0 °C | 55 mm | +10 mm |
| Jun | 21.1 °C | +1.5 °C | 41 mm | -8 mm |
| Jul | 23.8 °C | +2.1 °C | 95 mm | +30 mm |
| Aug | 21.8 °C | +0.9 °C | 42 mm | -16 mm |
| Sep | 19.0 °C | +2.3 °C | 38 mm | -10 mm |
| Oct | 12.3 °C | +1.0 °C | 58 mm | +13 mm |
| Nov | 6.5 °C | +0.7 °C | 39 mm | -7 mm |
| Dec | 5.9 °C | +3.3 °C | 24 mm | -20 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 Oskarshamn?
Oskarshamn has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.6 °C and it receives 535 mm of precipitation per year.
What is the hottest day ever recorded in Oskarshamn?
The hottest day measured in Oskarshamn between 1940 and 2025 was 21 July 2022, reaching 33.7 °C.
What is the coldest day in Oskarshamn?
The coldest day measured in Oskarshamn between 1940 and 2025 was 27 January 1942, at -24.3 °C.
Does it snow in Oskarshamn?
Yes. Oskarshamn gets on average 70.1 cm of snow per year and has around 97 frost days.
Has the climate of Oskarshamn warmed?
Yes: Oskarshamn warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Oskarshamn?
The wettest day measured in Oskarshamn between 1940 and 2025 was 31 August 2018, with 54 mm of rain in 24 hours.
What was the windiest day in Oskarshamn?
The windiest day measured in Oskarshamn between 1940 and 2025 was 8 January 2005, with winds reaching 56.9 km/h.
What is the warmest month in Oskarshamn?
The warmest month in Oskarshamn is July (17.6 °C on average); the coldest is February (-1.2 °C).
How much does it rain in Oskarshamn?
Oskarshamn receives on average 535 mm of precipitation per year, spread over about 115 rainy days.
Is it sunny in Oskarshamn?
Oskarshamn 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 Oskarshamn?
The heaviest 24-hour snowfall measured in Oskarshamn between 1940 and 2025 was 4 April 1998, with 21.3 cm.
Are there tropical nights in Oskarshamn?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Oskarshamn.
What was the most extreme apparent temperature in Oskarshamn?
In Oskarshamn, between 1940 and 2025, the highest apparent temperature reached 34.1 °C on 7 August 1975, and the lowest was -29.9 °C on 27 January 1942.
Compare Oskarshamn with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Oskarshamn