Karhula climate — normals and trends
Karhula (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.8 °C and it receives 654 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 (17.3 °C on average) and the coldest is February (-6.5 °C). Rainfall peaks in August.
Karhula averages 143 frost days, 0 hot days (≥ 30 °C) and 131 rainy days per year.
Karhula has warmed by +2.5 °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 163 to 123 per year over the period.
The hottest day of the period reached 30.5 °C (on 28 July 2010) and the coldest -35.2 °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
KarhulaKymenlaakso
- coords
- 60.52°, 26.93°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.8°C
Average daily high
7.4°C
Average daily low
2.1°C
Annual rainfall
654mm
Sunshine / day
7.3h
Mean relative humidity
81%
Average peak wind
19.7km/h
Seasonal range
23.8°C
Frost days (< 0 °C)
143 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
135.3 cm
Average feels-like high
4.0 °C
Average feels-like low
-1.7 °C
Average peak gust
36.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.40 · 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
30.5 °C
28 July 2010
Coldest day
-35.2 °C
10 January 1987
Wettest day
47 mm
13 July 1944
Windiest day
48.1 km/h
18 December 1966
Strongest gust
96.5 km/h
1 December 1999
Hottest feels-like
31.7 °C
8 August 2010
Coldest feels-like
-41.9 °C
10 January 1987
Snowiest day
14.3 cm
26 March 2008
Sunniest day
18.0 h
16 June 1940
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 | 1.1 °C | +5.1 °C | 77 mm | +28 mm |
| Feb | -1.5 °C | +2.7 °C | 11 mm | -29 mm |
| Mar | 4.4 °C | +4.5 °C | 25 mm | -13 mm |
| Apr | 8.4 °C | +2.7 °C | 37 mm | -1 mm |
| May | 12.3 °C | -0.2 °C | 60 mm | +17 mm |
| Jun | 16.9 °C | -0.2 °C | 160 mm | +106 mm |
| Jul | 23.4 °C | +3.0 °C | 71 mm | +7 mm |
| Aug | 19.0 °C | -0.1 °C | 123 mm | +48 mm |
| Sep | 17.1 °C | +3.2 °C | 58 mm | -7 mm |
| Oct | 9.4 °C | +1.7 °C | 57 mm | -6 mm |
| Nov | 5.6 °C | +3.2 °C | 59 mm | -5 mm |
| Dec | 3.0 °C | +4.2 °C | 56 mm | -5 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 Karhula?
Karhula has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.8 °C and it receives 654 mm of precipitation per year.
What is the hottest day ever recorded in Karhula?
The hottest day measured in Karhula between 1940 and 2025 was 28 July 2010, reaching 30.5 °C.
What is the coldest day in Karhula?
The coldest day measured in Karhula between 1940 and 2025 was 10 January 1987, at -35.2 °C.
Does it snow in Karhula?
Yes. Karhula gets on average 135.3 cm of snow per year and has around 143 frost days.
Has the climate of Karhula warmed?
Yes: Karhula warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Karhula?
The wettest day measured in Karhula between 1940 and 2025 was 13 July 1944, with 47 mm of rain in 24 hours.
What was the windiest day in Karhula?
The windiest day measured in Karhula between 1940 and 2025 was 18 December 1966, with winds reaching 48.1 km/h.
What is the warmest month in Karhula?
The warmest month in Karhula is July (17.3 °C on average); the coldest is February (-6.5 °C).
How much does it rain in Karhula?
Karhula receives on average 654 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Karhula?
Karhula gets on average 7.3 hours of sunshine per day, roughly 2,665 hours per year over 1940-2025.
What is the biggest single-day snowfall in Karhula?
The heaviest 24-hour snowfall measured in Karhula between 1940 and 2025 was 26 March 2008, with 14.3 cm.
Are there tropical nights in Karhula?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Karhula.
What was the most extreme apparent temperature in Karhula?
In Karhula, between 1940 and 2025, the highest apparent temperature reached 31.7 °C on 8 August 2010, and the lowest was -41.9 °C on 10 January 1987.
Compare Karhula with another city
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Nearby cities
The climate around Karhula