Karlskrona climate — normals and trends
Karlskrona (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.5 °C and it receives 594 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 (16.7 °C on average) and the coldest is February (-0.7 °C). Rainfall peaks in July.
Karlskrona averages 79 frost days, 0 hot days (≥ 30 °C) and 123 rainy days per year.
Karlskrona has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 99 to 59 per year over the period.
The hottest day of the period reached 29.0 °C (on 9 August 1975) and the coldest -22.4 °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
KarlskronaBlekinge County
- coords
- 56.16°, 15.59°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.5°C
Average daily high
9.9°C
Average daily low
5.2°C
Annual rainfall
594mm
Sunshine / day
7.8h
Mean relative humidity
81%
Average peak wind
22.1km/h
Seasonal range
17.4°C
Frost days (< 0 °C)
79 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
67.2 cm
Average feels-like high
6.6 °C
Average feels-like low
1.5 °C
Average peak gust
40.1 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.37 · 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
29.0 °C
9 August 1975
Coldest day
-22.4 °C
27 January 1942
Wettest day
47 mm
9 July 1996
Windiest day
61.7 km/h
8 January 2005
Strongest gust
120.6 km/h
18 October 1967
Hottest feels-like
31.0 °C
27 July 1994
Coldest feels-like
-29.3 °C
25 January 1942
Snowiest day
19.7 cm
11 January 1968
Sunniest day
16.6 h
22 June 2019
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 | +2.8 °C | 73 mm | +23 mm |
| Feb | 2.6 °C | +1.4 °C | 10 mm | -29 mm |
| Mar | 7.3 °C | +3.5 °C | 7 mm | -28 mm |
| Apr | 11.5 °C | +3.4 °C | 10 mm | -26 mm |
| May | 13.1 °C | +0.2 °C | 47 mm | +4 mm |
| Jun | 17.8 °C | +0.6 °C | 44 mm | -5 mm |
| Jul | 20.8 °C | +1.3 °C | 93 mm | +28 mm |
| Aug | 19.9 °C | +0.7 °C | 35 mm | -25 mm |
| Sep | 17.7 °C | +2.1 °C | 64 mm | +10 mm |
| Oct | 11.8 °C | +0.9 °C | 73 mm | +19 mm |
| Nov | 6.8 °C | +0.8 °C | 35 mm | -21 mm |
| Dec | 5.7 °C | +2.8 °C | 21 mm | -34 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 Karlskrona?
Karlskrona has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.5 °C and it receives 594 mm of precipitation per year.
What is the hottest day ever recorded in Karlskrona?
The hottest day measured in Karlskrona between 1940 and 2025 was 9 August 1975, reaching 29.0 °C.
What is the coldest day in Karlskrona?
The coldest day measured in Karlskrona between 1940 and 2025 was 27 January 1942, at -22.4 °C.
Does it snow in Karlskrona?
Yes. Karlskrona gets on average 67.2 cm of snow per year and has around 79 frost days.
Has the climate of Karlskrona warmed?
Yes: Karlskrona warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Karlskrona?
The wettest day measured in Karlskrona between 1940 and 2025 was 9 July 1996, with 47 mm of rain in 24 hours.
What was the windiest day in Karlskrona?
The windiest day measured in Karlskrona between 1940 and 2025 was 8 January 2005, with winds reaching 61.7 km/h.
What is the warmest month in Karlskrona?
The warmest month in Karlskrona is July (16.7 °C on average); the coldest is February (-0.7 °C).
How much does it rain in Karlskrona?
Karlskrona receives on average 594 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in Karlskrona?
Karlskrona 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 Karlskrona?
The heaviest 24-hour snowfall measured in Karlskrona between 1940 and 2025 was 11 January 1968, with 19.7 cm.
Are there tropical nights in Karlskrona?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Karlskrona.
What was the most extreme apparent temperature in Karlskrona?
In Karlskrona, between 1940 and 2025, the highest apparent temperature reached 31.0 °C on 27 July 1994, and the lowest was -29.3 °C on 25 January 1942.
Compare Karlskrona with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Karlskrona