Imatra climate — normals and trends
Imatra (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.1 °C and it receives 627 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 (17.4 °C on average) and the coldest is January (-8.4 °C). Rainfall peaks in August.
Imatra averages 160 frost days, 1 hot days (≥ 30 °C) and 133 rainy days per year.
Imatra has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 177 to 143 per year over the period.
The hottest day of the period reached 33.3 °C (on 8 August 2010) and the coldest -37.7 °C (on 12 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
ImatraSouth Karelia
- coords
- 61.17°, 28.75°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.1°C
Average daily high
7.0°C
Average daily low
1.0°C
Annual rainfall
627mm
Sunshine / day
7.1h
Mean relative humidity
81%
Average peak wind
17.0km/h
Seasonal range
25.8°C
Frost days (< 0 °C)
160 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
140.7 cm
Average feels-like high
3.7 °C
Average feels-like low
-2.6 °C
Average peak gust
35.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.36 · 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
8 August 2010
Coldest day
-37.7 °C
12 January 1987
Wettest day
41 mm
13 September 1962
Windiest day
44.3 km/h
7 September 1977
Strongest gust
95.0 km/h
20 January 1976
Hottest feels-like
34.3 °C
7 August 2010
Coldest feels-like
-43.1 °C
10 January 1987
Snowiest day
16.1 cm
1 November 2006
Sunniest day
18.0 h
8 July 2014
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 | -0.7 °C | +5.3 °C | 68 mm | +27 mm |
| Feb | -2.7 °C | +2.9 °C | 10 mm | -23 mm |
| Mar | 3.6 °C | +4.2 °C | 31 mm | -4 mm |
| Apr | 8.3 °C | +2.3 °C | 48 mm | +12 mm |
| May | 12.7 °C | -0.9 °C | 88 mm | +44 mm |
| Jun | 17.8 °C | -0.9 °C | 98 mm | +38 mm |
| Jul | 24.8 °C | +3.8 °C | 70 mm | -5 mm |
| Aug | 19.2 °C | +0.1 °C | 91 mm | +11 mm |
| Sep | 17.3 °C | +3.8 °C | 58 mm | -4 mm |
| Oct | 8.5 °C | +1.7 °C | 41 mm | -16 mm |
| Nov | 4.1 °C | +3.2 °C | 62 mm | +8 mm |
| Dec | 1.6 °C | +4.7 °C | 52 mm | +2 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 Imatra?
Imatra has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.1 °C and it receives 627 mm of precipitation per year.
What is the hottest day ever recorded in Imatra?
The hottest day measured in Imatra between 1940 and 2025 was 8 August 2010, reaching 33.3 °C.
What is the coldest day in Imatra?
The coldest day measured in Imatra between 1940 and 2025 was 12 January 1987, at -37.7 °C.
Does it snow in Imatra?
Yes. Imatra gets on average 140.7 cm of snow per year and has around 160 frost days.
Has the climate of Imatra warmed?
Yes: Imatra warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Imatra?
The wettest day measured in Imatra between 1940 and 2025 was 13 September 1962, with 41 mm of rain in 24 hours.
What was the windiest day in Imatra?
The windiest day measured in Imatra between 1940 and 2025 was 7 September 1977, with winds reaching 44.3 km/h.
What is the warmest month in Imatra?
The warmest month in Imatra is July (17.4 °C on average); the coldest is January (-8.4 °C).
How much does it rain in Imatra?
Imatra receives on average 627 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Imatra?
Imatra gets on average 7.1 hours of sunshine per day, roughly 2,592 hours per year over 1940-2025.
What is the biggest single-day snowfall in Imatra?
The heaviest 24-hour snowfall measured in Imatra between 1940 and 2025 was 1 November 2006, with 16.1 cm.
Are there tropical nights in Imatra?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Imatra.
What was the most extreme apparent temperature in Imatra?
In Imatra, between 1940 and 2025, the highest apparent temperature reached 34.3 °C on 7 August 2010, and the lowest was -43.1 °C on 10 January 1987.
Compare Imatra with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Imatra