Mikkeli climate — normals and trends
Mikkeli (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 3.8 °C and it receives 644 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 (17.0 °C on average) and the coldest is January (-8.4 °C). Rainfall peaks in August.
Mikkeli averages 162 frost days, 0 hot days (≥ 30 °C) and 134 rainy days per year.
Mikkeli has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 177 to 147 per year over the period.
The hottest day of the period reached 32.4 °C (on 29 July 2010) and the coldest -37.0 °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
MikkeliSouth Savo
- coords
- 61.69°, 27.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
3.8°C
Average daily high
6.6°C
Average daily low
0.9°C
Annual rainfall
644mm
Sunshine / day
6.9h
Mean relative humidity
82%
Average peak wind
15.9km/h
Seasonal range
25.4°C
Frost days (< 0 °C)
162 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
139.4 cm
Average feels-like high
3.4 °C
Average feels-like low
-2.6 °C
Average peak gust
34.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.32 · 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
32.4 °C
29 July 2010
Coldest day
-37.0 °C
10 January 1987
Wettest day
60 mm
30 June 2020
Windiest day
42.2 km/h
7 September 1977
Strongest gust
95.8 km/h
26 October 1985
Hottest feels-like
32.4 °C
27 June 1988
Coldest feels-like
-42.8 °C
10 January 1987
Snowiest day
14.3 cm
31 March 1998
Sunniest day
18.3 h
13 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -1.4 °C | +4.7 °C | 53 mm | +14 mm |
| Feb | -2.7 °C | +3.1 °C | 14 mm | -17 mm |
| Mar | 3.4 °C | +4.2 °C | 38 mm | +5 mm |
| Apr | 7.7 °C | +2.5 °C | 46 mm | +8 mm |
| May | 12.0 °C | -0.7 °C | 50 mm | +4 mm |
| Jun | 17.4 °C | -0.6 °C | 111 mm | +42 mm |
| Jul | 24.1 °C | +3.8 °C | 69 mm | -15 mm |
| Aug | 19.0 °C | +0.5 °C | 85 mm | -1 mm |
| Sep | 16.7 °C | +3.7 °C | 75 mm | +12 mm |
| Oct | 8.0 °C | +1.6 °C | 57 mm | -0 mm |
| Nov | 3.9 °C | +3.3 °C | 47 mm | -6 mm |
| Dec | 1.3 °C | +4.7 °C | 64 mm | +17 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 Mikkeli?
Mikkeli has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 3.8 °C and it receives 644 mm of precipitation per year.
What is the hottest day ever recorded in Mikkeli?
The hottest day measured in Mikkeli between 1940 and 2025 was 29 July 2010, reaching 32.4 °C.
What is the coldest day in Mikkeli?
The coldest day measured in Mikkeli between 1940 and 2025 was 10 January 1987, at -37.0 °C.
Does it snow in Mikkeli?
Yes. Mikkeli gets on average 139.4 cm of snow per year and has around 162 frost days.
Has the climate of Mikkeli warmed?
Yes: Mikkeli warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mikkeli?
The wettest day measured in Mikkeli between 1940 and 2025 was 30 June 2020, with 60 mm of rain in 24 hours.
What was the windiest day in Mikkeli?
The windiest day measured in Mikkeli between 1940 and 2025 was 7 September 1977, with winds reaching 42.2 km/h.
What is the warmest month in Mikkeli?
The warmest month in Mikkeli is July (17.0 °C on average); the coldest is January (-8.4 °C).
How much does it rain in Mikkeli?
Mikkeli receives on average 644 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Mikkeli?
Mikkeli gets on average 6.9 hours of sunshine per day, roughly 2,519 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mikkeli?
The heaviest 24-hour snowfall measured in Mikkeli between 1940 and 2025 was 31 March 1998, with 14.3 cm.
Are there tropical nights in Mikkeli?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Mikkeli.
What was the most extreme apparent temperature in Mikkeli?
In Mikkeli, between 1940 and 2025, the highest apparent temperature reached 32.4 °C on 27 June 1988, and the lowest was -42.8 °C on 10 January 1987.
Compare Mikkeli with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mikkeli