Loimaa climate — normals and trends
Loimaa (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.7 °C and it receives 656 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 (16.7 °C on average) and the coldest is February (-6.4 °C). Rainfall peaks in August.
Loimaa averages 159 frost days, 1 hot days (≥ 30 °C) and 129 rainy days per year.
Loimaa has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 176 to 142 per year over the period.
The hottest day of the period reached 32.3 °C (on 17 July 2018) and the coldest -36.8 °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
LoimaaSouthwest Finland
- coords
- 60.85°, 23.06°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.7°C
Average daily high
8.1°C
Average daily low
0.9°C
Annual rainfall
656mm
Sunshine / day
7.3h
Mean relative humidity
81%
Average peak wind
16.5km/h
Seasonal range
23.1°C
Frost days (< 0 °C)
159 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
129 d/yr
Annual snowfall
118.2 cm
Average feels-like high
4.9 °C
Average feels-like low
-2.5 °C
Average peak gust
35.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.37 · 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
32.3 °C
17 July 2018
Coldest day
-36.8 °C
10 January 1987
Wettest day
49 mm
29 July 1988
Windiest day
43.5 km/h
26 December 2011
Strongest gust
95.4 km/h
10 February 2020
Hottest feels-like
32.6 °C
14 July 2021
Coldest feels-like
-43.0 °C
10 January 1987
Snowiest day
18.3 cm
18 December 1966
Sunniest day
18.2 h
21 June 1940
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 | 0.8 °C | +4.5 °C | 59 mm | +13 mm |
| Feb | 0.0 °C | +3.6 °C | 19 mm | -16 mm |
| Mar | 6.1 °C | +5.2 °C | 16 mm | -19 mm |
| Apr | 9.8 °C | +2.4 °C | 46 mm | +6 mm |
| May | 13.1 °C | -1.2 °C | 40 mm | -6 mm |
| Jun | 17.7 °C | -1.2 °C | 81 mm | +19 mm |
| Jul | 24.1 °C | +3.2 °C | 100 mm | +16 mm |
| Aug | 18.9 °C | -0.5 °C | 84 mm | -2 mm |
| Sep | 17.2 °C | +3.1 °C | 72 mm | +10 mm |
| Oct | 9.2 °C | +1.4 °C | 52 mm | -2 mm |
| Nov | 5.3 °C | +3.1 °C | 46 mm | -9 mm |
| Dec | 3.7 °C | +5.0 °C | 55 mm | +4 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 Loimaa?
Loimaa has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.7 °C and it receives 656 mm of precipitation per year.
What is the hottest day ever recorded in Loimaa?
The hottest day measured in Loimaa between 1940 and 2025 was 17 July 2018, reaching 32.3 °C.
What is the coldest day in Loimaa?
The coldest day measured in Loimaa between 1940 and 2025 was 10 January 1987, at -36.8 °C.
Does it snow in Loimaa?
Yes. Loimaa gets on average 118.2 cm of snow per year and has around 159 frost days.
Has the climate of Loimaa warmed?
Yes: Loimaa warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Loimaa?
The wettest day measured in Loimaa between 1940 and 2025 was 29 July 1988, with 49 mm of rain in 24 hours.
What was the windiest day in Loimaa?
The windiest day measured in Loimaa between 1940 and 2025 was 26 December 2011, with winds reaching 43.5 km/h.
What is the warmest month in Loimaa?
The warmest month in Loimaa is July (16.7 °C on average); the coldest is February (-6.4 °C).
How much does it rain in Loimaa?
Loimaa receives on average 656 mm of precipitation per year, spread over about 129 rainy days.
Is it sunny in Loimaa?
Loimaa 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 Loimaa?
The heaviest 24-hour snowfall measured in Loimaa between 1940 and 2025 was 18 December 1966, with 18.3 cm.
Are there tropical nights in Loimaa?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Loimaa.
What was the most extreme apparent temperature in Loimaa?
In Loimaa, between 1940 and 2025, the highest apparent temperature reached 32.6 °C on 14 July 2021, and the lowest was -43.0 °C on 10 January 1987.
Compare Loimaa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Loimaa