Mäntyharju climate — normals and trends
Mäntyharju (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.0 °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 (17.2 °C on average) and the coldest is January (-8.2 °C). Rainfall peaks in August.
Mäntyharju averages 161 frost days, 1 hot days (≥ 30 °C) and 132 rainy days per year.
Mäntyharju 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 176 to 146 per year over the period.
The hottest day of the period reached 33.3 °C (on 29 July 2010) and the coldest -38.2 °C (on 8 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
MäntyharjuSouth Savo
- coords
- 61.42°, 26.88°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.0°C
Average daily high
7.1°C
Average daily low
0.9°C
Annual rainfall
638mm
Sunshine / day
6.8h
Mean relative humidity
80%
Average peak wind
15.8km/h
Seasonal range
25.4°C
Frost days (< 0 °C)
161 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
132 d/yr
Annual snowfall
135.3 cm
Average feels-like high
3.9 °C
Average feels-like low
-2.6 °C
Average peak gust
34.7 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 = 0.33 · 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
33.3 °C
29 July 2010
Coldest day
-38.2 °C
8 January 1987
Wettest day
60 mm
8 August 1966
Windiest day
42.0 km/h
26 October 1985
Strongest gust
93.2 km/h
27 May 1986
Hottest feels-like
33.8 °C
7 August 2010
Coldest feels-like
-43.5 °C
8 January 1987
Snowiest day
14.2 cm
18 March 1961
Sunniest day
18.3 h
1 July 2018
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 | -0.9 °C | +4.9 °C | 54 mm | +15 mm |
| Feb | -2.5 °C | +2.9 °C | 13 mm | -18 mm |
| Mar | 3.9 °C | +4.2 °C | 36 mm | +3 mm |
| Apr | 8.8 °C | +2.7 °C | 45 mm | +8 mm |
| May | 12.8 °C | -1.1 °C | 46 mm | 0 mm |
| Jun | 17.9 °C | -1.1 °C | 125 mm | +58 mm |
| Jul | 24.7 °C | +3.6 °C | 72 mm | -12 mm |
| Aug | 19.3 °C | +0.2 °C | 92 mm | +7 mm |
| Sep | 17.1 °C | +3.7 °C | 67 mm | +6 mm |
| Oct | 8.3 °C | +1.6 °C | 55 mm | -2 mm |
| Nov | 4.1 °C | +3.3 °C | 44 mm | -8 mm |
| Dec | 1.6 °C | +4.7 °C | 59 mm | +13 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 Mäntyharju?
Mäntyharju has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.0 °C and it receives 638 mm of precipitation per year.
What is the hottest day ever recorded in Mäntyharju?
The hottest day measured in Mäntyharju between 1940 and 2025 was 29 July 2010, reaching 33.3 °C.
What is the coldest day in Mäntyharju?
The coldest day measured in Mäntyharju between 1940 and 2025 was 8 January 1987, at -38.2 °C.
Does it snow in Mäntyharju?
Yes. Mäntyharju gets on average 135.3 cm of snow per year and has around 161 frost days.
Has the climate of Mäntyharju warmed?
Yes: Mäntyharju warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mäntyharju?
The wettest day measured in Mäntyharju between 1940 and 2025 was 8 August 1966, with 60 mm of rain in 24 hours.
What was the windiest day in Mäntyharju?
The windiest day measured in Mäntyharju between 1940 and 2025 was 26 October 1985, with winds reaching 42.0 km/h.
What is the warmest month in Mäntyharju?
The warmest month in Mäntyharju is July (17.2 °C on average); the coldest is January (-8.2 °C).
How much does it rain in Mäntyharju?
Mäntyharju receives on average 638 mm of precipitation per year, spread over about 132 rainy days.
Is it sunny in Mäntyharju?
Mäntyharju gets on average 6.8 hours of sunshine per day, roughly 2,482 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mäntyharju?
The heaviest 24-hour snowfall measured in Mäntyharju between 1940 and 2025 was 18 March 1961, with 14.2 cm.
Are there tropical nights in Mäntyharju?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Mäntyharju.
What was the most extreme apparent temperature in Mäntyharju?
In Mäntyharju, between 1940 and 2025, the highest apparent temperature reached 33.8 °C on 7 August 2010, and the lowest was -43.5 °C on 8 January 1987.
Compare Mäntyharju with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mäntyharju