Heinola climate — normals and trends
Heinola (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.2 °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 (16.9 °C on average) and the coldest is January (-7.6 °C). Rainfall peaks in August.
Heinola averages 156 frost days, 0 hot days (≥ 30 °C) and 131 rainy days per year.
Heinola 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 173 to 139 per year over the period.
The hottest day of the period reached 31.5 °C (on 29 July 2010) and the coldest -37.4 °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
HeinolaPaijat-Hame
- coords
- 61.21°, 26.04°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.2°C
Average daily high
7.0°C
Average daily low
1.3°C
Annual rainfall
627mm
Sunshine / day
6.9h
Mean relative humidity
82%
Average peak wind
15.9km/h
Seasonal range
24.5°C
Frost days (< 0 °C)
156 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
132.8 cm
Average feels-like high
3.9 °C
Average feels-like low
-2.2 °C
Average peak gust
34.6 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
31.5 °C
29 July 2010
Coldest day
-37.4 °C
10 January 1987
Wettest day
72 mm
12 August 1972
Windiest day
40.7 km/h
11 November 1983
Strongest gust
91.4 km/h
10 February 2020
Hottest feels-like
31.8 °C
11 July 1941
Coldest feels-like
-43.3 °C
10 January 1987
Snowiest day
15.7 cm
20 December 1970
Sunniest day
18.5 h
28 June 2019
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 | -0.4 °C | +4.9 °C | 51 mm | +11 mm |
| Feb | -2.2 °C | +2.8 °C | 16 mm | -17 mm |
| Mar | 4.3 °C | +4.4 °C | 29 mm | -4 mm |
| Apr | 8.4 °C | +2.4 °C | 39 mm | +2 mm |
| May | 12.2 °C | -0.7 °C | 44 mm | -1 mm |
| Jun | 16.9 °C | -0.9 °C | 130 mm | +66 mm |
| Jul | 23.6 °C | +3.4 °C | 71 mm | -8 mm |
| Aug | 18.8 °C | +0.1 °C | 96 mm | +15 mm |
| Sep | 16.6 °C | +3.3 °C | 67 mm | +7 mm |
| Oct | 8.5 °C | +1.5 °C | 54 mm | -2 mm |
| Nov | 4.6 °C | +3.3 °C | 41 mm | -10 mm |
| Dec | 2.2 °C | +4.8 °C | 56 mm | +9 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 Heinola?
Heinola has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.2 °C and it receives 627 mm of precipitation per year.
What is the hottest day ever recorded in Heinola?
The hottest day measured in Heinola between 1940 and 2025 was 29 July 2010, reaching 31.5 °C.
What is the coldest day in Heinola?
The coldest day measured in Heinola between 1940 and 2025 was 10 January 1987, at -37.4 °C.
Does it snow in Heinola?
Yes. Heinola gets on average 132.8 cm of snow per year and has around 156 frost days.
Has the climate of Heinola warmed?
Yes: Heinola warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Heinola?
The wettest day measured in Heinola between 1940 and 2025 was 12 August 1972, with 72 mm of rain in 24 hours.
What was the windiest day in Heinola?
The windiest day measured in Heinola between 1940 and 2025 was 11 November 1983, with winds reaching 40.7 km/h.
What is the warmest month in Heinola?
The warmest month in Heinola is July (16.9 °C on average); the coldest is January (-7.6 °C).
How much does it rain in Heinola?
Heinola receives on average 627 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Heinola?
Heinola 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 Heinola?
The heaviest 24-hour snowfall measured in Heinola between 1940 and 2025 was 20 December 1970, with 15.7 cm.
Are there tropical nights in Heinola?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Heinola.
What was the most extreme apparent temperature in Heinola?
In Heinola, between 1940 and 2025, the highest apparent temperature reached 31.8 °C on 11 July 1941, and the lowest was -43.3 °C on 10 January 1987.
Compare Heinola with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Heinola