Östermalm climate — normals and trends
Östermalm (Sweden) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 6.4 °C and it receives 562 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 (17.1 °C on average) and the coldest is February (-2.9 °C). Rainfall peaks in August.
Östermalm averages 118 frost days, 0 hot days (≥ 30 °C) and 117 rainy days per year.
Östermalm 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 133 to 103 per year over the period.
The hottest day of the period reached 33.6 °C (on 8 August 1975) and the coldest -26.0 °C (on 10 January 1987).
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
ÖstermalmStockholm County
- coords
- 59.34°, 18.08°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
6.4°C
Average daily high
9.3°C
Average daily low
3.5°C
Annual rainfall
562mm
Sunshine / day
7.8h
Mean relative humidity
80%
Average peak wind
18.2km/h
Seasonal range
20.0°C
Frost days (< 0 °C)
118 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
117 d/yr
Annual snowfall
83.2 cm
Average feels-like high
6.3 °C
Average feels-like low
0.0 °C
Average peak gust
39.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.29 · 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
33.6 °C
8 August 1975
Coldest day
-26.0 °C
10 January 1987
Wettest day
57 mm
9 July 1945
Windiest day
49.6 km/h
2 November 1969
Strongest gust
106.6 km/h
13 January 1984
Hottest feels-like
33.6 °C
7 August 1975
Coldest feels-like
-33.1 °C
10 January 1987
Snowiest day
18.6 cm
9 November 2010
Sunniest day
17.9 h
25 June 2020
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 | 1.9 °C | +2.7 °C | 62 mm | +21 mm |
| Feb | 1.3 °C | +1.9 °C | 6 mm | -26 mm |
| Mar | 7.6 °C | +4.6 °C | 7 mm | -23 mm |
| Apr | 11.0 °C | +2.9 °C | 15 mm | -20 mm |
| May | 13.0 °C | -0.6 °C | 29 mm | -11 mm |
| Jun | 18.6 °C | +0.4 °C | 64 mm | +11 mm |
| Jul | 22.7 °C | +2.1 °C | 96 mm | +29 mm |
| Aug | 19.3 °C | -0.4 °C | 66 mm | -4 mm |
| Sep | 17.7 °C | +2.5 °C | 67 mm | +15 mm |
| Oct | 10.9 °C | +1.2 °C | 52 mm | +5 mm |
| Nov | 5.5 °C | +1.3 °C | 31 mm | -19 mm |
| Dec | 4.9 °C | +3.7 °C | 38 mm | -7 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 Östermalm?
Östermalm has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 6.4 °C and it receives 562 mm of precipitation per year.
What is the hottest day ever recorded in Östermalm?
The hottest day measured in Östermalm between 1940 and 2025 was 8 August 1975, reaching 33.6 °C.
What is the coldest day in Östermalm?
The coldest day measured in Östermalm between 1940 and 2025 was 10 January 1987, at -26.0 °C.
Does it snow in Östermalm?
Yes. Östermalm gets on average 83.2 cm of snow per year and has around 118 frost days.
Has the climate of Östermalm warmed?
Yes: Östermalm warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Östermalm?
The wettest day measured in Östermalm between 1940 and 2025 was 9 July 1945, with 57 mm of rain in 24 hours.
What was the windiest day in Östermalm?
The windiest day measured in Östermalm between 1940 and 2025 was 2 November 1969, with winds reaching 49.6 km/h.
What is the warmest month in Östermalm?
The warmest month in Östermalm is July (17.1 °C on average); the coldest is February (-2.9 °C).
How much does it rain in Östermalm?
Östermalm receives on average 562 mm of precipitation per year, spread over about 117 rainy days.
Is it sunny in Östermalm?
Östermalm 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 Östermalm?
The heaviest 24-hour snowfall measured in Östermalm between 1940 and 2025 was 9 November 2010, with 18.6 cm.
Are there tropical nights in Östermalm?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Östermalm.
What was the most extreme apparent temperature in Östermalm?
In Östermalm, between 1940 and 2025, the highest apparent temperature reached 33.6 °C on 7 August 1975, and the lowest was -33.1 °C on 10 January 1987.
Compare Östermalm with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Östermalm