Lohja climate — normals and trends
Lohja (Finland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.1 °C and it receives 672 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 (17.0 °C on average) and the coldest is February (-5.8 °C). Rainfall peaks in August.
Lohja averages 144 frost days, 0 hot days (≥ 30 °C) and 130 rainy days per year.
Lohja has warmed by +2.4 °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 164 to 124 per year over the period.
The hottest day of the period reached 32.0 °C (on 28 July 2019) and the coldest -36.4 °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
LohjaUusimaa
- coords
- 60.25°, 24.07°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.1°C
Average daily high
7.9°C
Average daily low
2.0°C
Annual rainfall
672mm
Sunshine / day
7.4h
Mean relative humidity
82%
Average peak wind
18.6km/h
Seasonal range
22.8°C
Frost days (< 0 °C)
144 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
131.8 cm
Average feels-like high
4.7 °C
Average feels-like low
-1.6 °C
Average peak gust
37.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.38 · 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
32.0 °C
28 July 2019
Coldest day
-36.4 °C
10 January 1987
Wettest day
85 mm
12 August 1972
Windiest day
56.2 km/h
23 January 1995
Strongest gust
112.3 km/h
23 January 1995
Hottest feels-like
32.8 °C
28 July 2019
Coldest feels-like
-43.2 °C
10 January 1987
Snowiest day
16.5 cm
16 February 1999
Sunniest day
17.8 h
26 June 2025
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 | 1.3 °C | +4.5 °C | 68 mm | +15 mm |
| Feb | -0.4 °C | +3.1 °C | 21 mm | -20 mm |
| Mar | 5.3 °C | +5.0 °C | 12 mm | -26 mm |
| Apr | 9.2 °C | +2.9 °C | 45 mm | +6 mm |
| May | 12.9 °C | -0.3 °C | 35 mm | -6 mm |
| Jun | 17.2 °C | -0.7 °C | 104 mm | +49 mm |
| Jul | 23.2 °C | +2.7 °C | 97 mm | +22 mm |
| Aug | 18.8 °C | -0.4 °C | 72 mm | -11 mm |
| Sep | 16.8 °C | +2.7 °C | 95 mm | +30 mm |
| Oct | 9.4 °C | +1.3 °C | 55 mm | -4 mm |
| Nov | 6.0 °C | +3.2 °C | 43 mm | -20 mm |
| Dec | 3.8 °C | +4.4 °C | 60 mm | -1 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 Lohja?
Lohja has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.1 °C and it receives 672 mm of precipitation per year.
What is the hottest day ever recorded in Lohja?
The hottest day measured in Lohja between 1940 and 2025 was 28 July 2019, reaching 32.0 °C.
What is the coldest day in Lohja?
The coldest day measured in Lohja between 1940 and 2025 was 10 January 1987, at -36.4 °C.
Does it snow in Lohja?
Yes. Lohja gets on average 131.8 cm of snow per year and has around 144 frost days.
Has the climate of Lohja warmed?
Yes: Lohja warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lohja?
The wettest day measured in Lohja between 1940 and 2025 was 12 August 1972, with 85 mm of rain in 24 hours.
What was the windiest day in Lohja?
The windiest day measured in Lohja between 1940 and 2025 was 23 January 1995, with winds reaching 56.2 km/h.
What is the warmest month in Lohja?
The warmest month in Lohja is July (17.0 °C on average); the coldest is February (-5.8 °C).
How much does it rain in Lohja?
Lohja receives on average 672 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Lohja?
Lohja gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Lohja?
The heaviest 24-hour snowfall measured in Lohja between 1940 and 2025 was 16 February 1999, with 16.5 cm.
Are there tropical nights in Lohja?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Lohja.
What was the most extreme apparent temperature in Lohja?
In Lohja, between 1940 and 2025, the highest apparent temperature reached 32.8 °C on 28 July 2019, and the lowest was -43.2 °C on 10 January 1987.
Compare Lohja with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Lohja