Suomussalmi climate — normals and trends
Suomussalmi (Finland) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 1.2 °C and it receives 638 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 (15.4 °C on average) and the coldest is January (-11.8 °C). Rainfall peaks in August.
Suomussalmi averages 198 frost days, 0 hot days (≥ 30 °C) and 136 rainy days per year.
Suomussalmi has warmed by +1.9 °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 206 to 190 per year over the period.
The hottest day of the period reached 32.2 °C (on 29 July 2010) and the coldest -41.0 °C (on 8 January 1985).
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
SuomussalmiKainuu
- coords
- 64.89°, 28.91°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
1.2°C
Average daily high
4.4°C
Average daily low
-2.2°C
Annual rainfall
638mm
Sunshine / day
6.2h
Mean relative humidity
81%
Average peak wind
15.6km/h
Seasonal range
27.2°C
Frost days (< 0 °C)
198 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
136 d/yr
Annual snowfall
175.1 cm
Average feels-like high
0.8 °C
Average feels-like low
-6.0 °C
Average peak gust
34.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
7.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.22 · 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
32.2 °C
29 July 2010
Coldest day
-41.0 °C
8 January 1985
Wettest day
50 mm
3 August 2021
Windiest day
40.3 km/h
26 December 1992
Strongest gust
100.8 km/h
29 March 2019
Hottest feels-like
34.0 °C
29 July 2010
Coldest feels-like
-46.6 °C
7 January 1985
Snowiest day
19.3 cm
24 November 1994
Sunniest day
20.1 h
16 June 2023
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 | -5.9 °C | +3.2 °C | 44 mm | +9 mm |
| Feb | -4.1 °C | +4.3 °C | 20 mm | -10 mm |
| Mar | 1.1 °C | +3.9 °C | 36 mm | +3 mm |
| Apr | 5.5 °C | +1.9 °C | 15 mm | -24 mm |
| May | 11.0 °C | +0.2 °C | 80 mm | +29 mm |
| Jun | 15.5 °C | -1.2 °C | 74 mm | +5 mm |
| Jul | 23.5 °C | +4.2 °C | 57 mm | -25 mm |
| Aug | 17.9 °C | +1.2 °C | 76 mm | -6 mm |
| Sep | 15.3 °C | +4.6 °C | 89 mm | +21 mm |
| Oct | 6.0 °C | +2.5 °C | 54 mm | -1 mm |
| Nov | 0.1 °C | +2.5 °C | 73 mm | +21 mm |
| Dec | -2.4 °C | +3.9 °C | 77 mm | +33 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 Suomussalmi?
Suomussalmi has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 1.2 °C and it receives 638 mm of precipitation per year.
What is the hottest day ever recorded in Suomussalmi?
The hottest day measured in Suomussalmi between 1940 and 2025 was 29 July 2010, reaching 32.2 °C.
What is the coldest day in Suomussalmi?
The coldest day measured in Suomussalmi between 1940 and 2025 was 8 January 1985, at -41.0 °C.
Does it snow in Suomussalmi?
Yes. Suomussalmi gets on average 175.1 cm of snow per year and has around 198 frost days.
Has the climate of Suomussalmi warmed?
Yes: Suomussalmi warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Suomussalmi?
The wettest day measured in Suomussalmi between 1940 and 2025 was 3 August 2021, with 50 mm of rain in 24 hours.
What was the windiest day in Suomussalmi?
The windiest day measured in Suomussalmi between 1940 and 2025 was 26 December 1992, with winds reaching 40.3 km/h.
What is the warmest month in Suomussalmi?
The warmest month in Suomussalmi is July (15.4 °C on average); the coldest is January (-11.8 °C).
How much does it rain in Suomussalmi?
Suomussalmi receives on average 638 mm of precipitation per year, spread over about 136 rainy days.
Is it sunny in Suomussalmi?
Suomussalmi gets on average 6.2 hours of sunshine per day, roughly 2,263 hours per year over 1940-2025.
What is the biggest single-day snowfall in Suomussalmi?
The heaviest 24-hour snowfall measured in Suomussalmi between 1940 and 2025 was 24 November 1994, with 19.3 cm.
Are there tropical nights in Suomussalmi?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Suomussalmi.
What was the most extreme apparent temperature in Suomussalmi?
In Suomussalmi, between 1940 and 2025, the highest apparent temperature reached 34.0 °C on 29 July 2010, and the lowest was -46.6 °C on 7 January 1985.
Compare Suomussalmi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Suomussalmi