Ähtäri climate — normals and trends
Ähtäri (Finland) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 3.4 °C and it receives 647 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 (16.2 °C on average) and the coldest is January (-8.4 °C). Rainfall peaks in August.
Ähtäri averages 176 frost days, 0 hot days (≥ 30 °C) and 132 rainy days per year.
Ähtäri has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 187 to 165 per year over the period.
The hottest day of the period reached 32.8 °C (on 29 July 2010) and the coldest -36.8 °C (on 9 January 1958).
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
ÄhtäriSouth Ostrobothnia
- coords
- 62.55°, 24.06°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
3.4°C
Average daily high
6.7°C
Average daily low
-0.2°C
Annual rainfall
647mm
Sunshine / day
6.8h
Mean relative humidity
81%
Average peak wind
15.8km/h
Seasonal range
24.6°C
Frost days (< 0 °C)
176 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
132 d/yr
Annual snowfall
137.7 cm
Average feels-like high
3.4 °C
Average feels-like low
-3.8 °C
Average peak gust
35.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.29 · 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
32.8 °C
29 July 2010
Coldest day
-36.8 °C
9 January 1958
Wettest day
40 mm
29 July 2023
Windiest day
41.6 km/h
26 October 1985
Strongest gust
104.8 km/h
26 October 1985
Hottest feels-like
33.0 °C
29 July 2010
Coldest feels-like
-41.9 °C
9 January 1958
Snowiest day
16.5 cm
25 January 2002
Sunniest day
19.0 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 | -2.1 °C | +3.7 °C | 45 mm | +8 mm |
| Feb | -1.7 °C | +3.6 °C | 15 mm | -14 mm |
| Mar | 4.0 °C | +4.2 °C | 33 mm | +2 mm |
| Apr | 8.9 °C | +2.9 °C | 39 mm | -0 mm |
| May | 12.4 °C | -1.2 °C | 66 mm | +17 mm |
| Jun | 17.2 °C | -1.1 °C | 85 mm | +16 mm |
| Jul | 24.6 °C | +4.2 °C | 70 mm | -16 mm |
| Aug | 18.4 °C | 0.0 °C | 82 mm | -5 mm |
| Sep | 16.2 °C | +3.5 °C | 73 mm | +10 mm |
| Oct | 7.7 °C | +1.8 °C | 56 mm | -1 mm |
| Nov | 3.2 °C | +3.0 °C | 59 mm | +7 mm |
| Dec | 1.3 °C | +4.7 °C | 72 mm | +25 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 Ähtäri?
Ähtäri has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 3.4 °C and it receives 647 mm of precipitation per year.
What is the hottest day ever recorded in Ähtäri?
The hottest day measured in Ähtäri between 1940 and 2025 was 29 July 2010, reaching 32.8 °C.
What is the coldest day in Ähtäri?
The coldest day measured in Ähtäri between 1940 and 2025 was 9 January 1958, at -36.8 °C.
Does it snow in Ähtäri?
Yes. Ähtäri gets on average 137.7 cm of snow per year and has around 176 frost days.
Has the climate of Ähtäri warmed?
Yes: Ähtäri warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ähtäri?
The wettest day measured in Ähtäri between 1940 and 2025 was 29 July 2023, with 40 mm of rain in 24 hours.
What was the windiest day in Ähtäri?
The windiest day measured in Ähtäri between 1940 and 2025 was 26 October 1985, with winds reaching 41.6 km/h.
What is the warmest month in Ähtäri?
The warmest month in Ähtäri is July (16.2 °C on average); the coldest is January (-8.4 °C).
How much does it rain in Ähtäri?
Ähtäri receives on average 647 mm of precipitation per year, spread over about 132 rainy days.
Is it sunny in Ähtäri?
Ähtäri 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 Ähtäri?
The heaviest 24-hour snowfall measured in Ähtäri between 1940 and 2025 was 25 January 2002, with 16.5 cm.
Are there tropical nights in Ähtäri?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ähtäri.
What was the most extreme apparent temperature in Ähtäri?
In Ähtäri, between 1940 and 2025, the highest apparent temperature reached 33.0 °C on 29 July 2010, and the lowest was -41.9 °C on 9 January 1958.
Compare Ähtäri with another city
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Nearby cities
The climate around Ähtäri