Iisalmi climate — normals and trends
Iisalmi (Finland) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 2.6 °C and it receives 677 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 (16.4 °C on average) and the coldest is January (-10.2 °C). Rainfall peaks in August.
Iisalmi averages 184 frost days, 1 hot days (≥ 30 °C) and 137 rainy days per year.
Iisalmi has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The number of frost days there went from about 194 to 174 per year over the period.
The hottest day of the period reached 35.1 °C (on 29 July 2010) and the coldest -40.7 °C (on 6 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
IisalmiNorth Savo
- coords
- 63.56°, 27.19°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
2.6°C
Average daily high
5.9°C
Average daily low
-1.0°C
Annual rainfall
677mm
Sunshine / day
6.6h
Mean relative humidity
81%
Average peak wind
15.4km/h
Seasonal range
26.6°C
Frost days (< 0 °C)
184 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
137 d/yr
Annual snowfall
160.5 cm
Average feels-like high
2.6 °C
Average feels-like low
-4.7 °C
Average peak gust
34.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °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
35.1 °C
29 July 2010
Coldest day
-40.7 °C
6 January 1985
Wettest day
67 mm
28 July 2004
Windiest day
44.4 km/h
18 April 1976
Strongest gust
94.0 km/h
26 October 1985
Hottest feels-like
34.9 °C
29 July 2010
Coldest feels-like
-46.0 °C
6 January 1985
Snowiest day
16.7 cm
21 November 1980
Sunniest day
19.4 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 | -3.7 °C | +3.8 °C | 48 mm | +9 mm |
| Feb | -3.1 °C | +3.7 °C | 20 mm | -12 mm |
| Mar | 2.7 °C | +4.0 °C | 39 mm | +5 mm |
| Apr | 7.6 °C | +2.3 °C | 15 mm | -25 mm |
| May | 12.5 °C | -0.6 °C | 64 mm | +11 mm |
| Jun | 17.0 °C | -1.2 °C | 100 mm | +27 mm |
| Jul | 25.3 °C | +4.8 °C | 42 mm | -43 mm |
| Aug | 19.4 °C | +1.3 °C | 47 mm | -41 mm |
| Sep | 16.5 °C | +4.3 °C | 75 mm | +6 mm |
| Oct | 7.2 °C | +2.1 °C | 63 mm | +5 mm |
| Nov | 2.3 °C | +3.1 °C | 67 mm | +11 mm |
| Dec | -0.7 °C | +4.1 °C | 80 mm | +32 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 Iisalmi?
Iisalmi has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 2.6 °C and it receives 677 mm of precipitation per year.
What is the hottest day ever recorded in Iisalmi?
The hottest day measured in Iisalmi between 1940 and 2025 was 29 July 2010, reaching 35.1 °C.
What is the coldest day in Iisalmi?
The coldest day measured in Iisalmi between 1940 and 2025 was 6 January 1985, at -40.7 °C.
Does it snow in Iisalmi?
Yes. Iisalmi gets on average 160.5 cm of snow per year and has around 184 frost days.
Has the climate of Iisalmi warmed?
Yes: Iisalmi warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Iisalmi?
The wettest day measured in Iisalmi between 1940 and 2025 was 28 July 2004, with 67 mm of rain in 24 hours.
What was the windiest day in Iisalmi?
The windiest day measured in Iisalmi between 1940 and 2025 was 18 April 1976, with winds reaching 44.4 km/h.
What is the warmest month in Iisalmi?
The warmest month in Iisalmi is July (16.4 °C on average); the coldest is January (-10.2 °C).
How much does it rain in Iisalmi?
Iisalmi receives on average 677 mm of precipitation per year, spread over about 137 rainy days.
Is it sunny in Iisalmi?
Iisalmi gets on average 6.6 hours of sunshine per day, roughly 2,409 hours per year over 1940-2025.
What is the biggest single-day snowfall in Iisalmi?
The heaviest 24-hour snowfall measured in Iisalmi between 1940 and 2025 was 21 November 1980, with 16.7 cm.
Are there tropical nights in Iisalmi?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Iisalmi.
What was the most extreme apparent temperature in Iisalmi?
In Iisalmi, between 1940 and 2025, the highest apparent temperature reached 34.9 °C on 29 July 2010, and the lowest was -46.0 °C on 6 January 1985.
Compare Iisalmi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Iisalmi