Masku climate — normals and trends
Masku (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.4 °C and it receives 660 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 February (-5.2 °C). Rainfall peaks in August.
Masku averages 136 frost days, 0 hot days (≥ 30 °C) and 127 rainy days per year.
Masku has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 155 to 117 per year over the period.
The hottest day of the period reached 31.4 °C (on 17 July 2018) and the coldest -35.7 °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
MaskuSouthwest Finland
- coords
- 60.57°, 22.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.4°C
Average daily high
8.2°C
Average daily low
2.4°C
Annual rainfall
660mm
Sunshine / day
7.9h
Mean relative humidity
81%
Average peak wind
19.4km/h
Seasonal range
22.1°C
Frost days (< 0 °C)
136 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
127 d/yr
Annual snowfall
101.7 cm
Average feels-like high
4.9 °C
Average feels-like low
-1.2 °C
Average peak gust
37.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °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
31.4 °C
17 July 2018
Coldest day
-35.7 °C
10 January 1987
Wettest day
79 mm
6 August 1967
Windiest day
52.1 km/h
22 February 2002
Strongest gust
104.4 km/h
14 January 1984
Hottest feels-like
33.2 °C
28 July 2019
Coldest feels-like
-42.3 °C
10 January 1987
Snowiest day
17.4 cm
12 January 2021
Sunniest day
18.0 h
28 June 2017
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 | 1.6 °C | +3.9 °C | 61 mm | +13 mm |
| Feb | 0.2 °C | +3.0 °C | 17 mm | -19 mm |
| Mar | 5.5 °C | +4.7 °C | 11 mm | -24 mm |
| Apr | 8.9 °C | +2.4 °C | 54 mm | +15 mm |
| May | 11.8 °C | -1.0 °C | 45 mm | +5 mm |
| Jun | 16.4 °C | -1.1 °C | 74 mm | +20 mm |
| Jul | 23.1 °C | +2.8 °C | 92 mm | +13 mm |
| Aug | 18.5 °C | -0.7 °C | 84 mm | -2 mm |
| Sep | 17.1 °C | +2.7 °C | 97 mm | +29 mm |
| Oct | 10.1 °C | +1.7 °C | 68 mm | +8 mm |
| Nov | 6.2 °C | +2.8 °C | 55 mm | -7 mm |
| Dec | 4.8 °C | +4.6 °C | 62 mm | +6 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 Masku?
Masku has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.4 °C and it receives 660 mm of precipitation per year.
What is the hottest day ever recorded in Masku?
The hottest day measured in Masku between 1940 and 2025 was 17 July 2018, reaching 31.4 °C.
What is the coldest day in Masku?
The coldest day measured in Masku between 1940 and 2025 was 10 January 1987, at -35.7 °C.
Does it snow in Masku?
Yes. Masku gets on average 101.7 cm of snow per year and has around 136 frost days.
Has the climate of Masku warmed?
Yes: Masku warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Masku?
The wettest day measured in Masku between 1940 and 2025 was 6 August 1967, with 79 mm of rain in 24 hours.
What was the windiest day in Masku?
The windiest day measured in Masku between 1940 and 2025 was 22 February 2002, with winds reaching 52.1 km/h.
What is the warmest month in Masku?
The warmest month in Masku is July (16.9 °C on average); the coldest is February (-5.2 °C).
How much does it rain in Masku?
Masku receives on average 660 mm of precipitation per year, spread over about 127 rainy days.
Is it sunny in Masku?
Masku gets on average 7.9 hours of sunshine per day, roughly 2,884 hours per year over 1940-2025.
What is the biggest single-day snowfall in Masku?
The heaviest 24-hour snowfall measured in Masku between 1940 and 2025 was 12 January 2021, with 17.4 cm.
Are there tropical nights in Masku?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Masku.
What was the most extreme apparent temperature in Masku?
In Masku, between 1940 and 2025, the highest apparent temperature reached 33.2 °C on 28 July 2019, and the lowest was -42.3 °C on 10 January 1987.
Compare Masku with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Masku