Osa climate — normals and trends
Osa (Russia) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 2.5 °C and it receives 629 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 (18.6 °C on average) and the coldest is January (-13.9 °C). Rainfall peaks in July.
Osa averages 180 frost days, 5 hot days (≥ 30 °C) and 135 rainy days per year.
Osa has warmed by +2.6 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 192 to 168 per year over the period.
The hottest day of the period reached 36.1 °C (on 11 July 2023) and the coldest -48.8 °C (on 31 December 1978).
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
OsaPerm Krai
- coords
- 57.28°, 55.46°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
2.5°C
Average daily high
6.1°C
Average daily low
-1.1°C
Annual rainfall
629mm
Sunshine / day
7.0h
Mean relative humidity
76%
Average peak wind
17.1km/h
Seasonal range
32.5°C
Frost days (< 0 °C)
180 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
135 d/yr
Annual snowfall
172.6 cm
Average feels-like high
2.8 °C
Average feels-like low
-4.9 °C
Average peak gust
34.2 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
10.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.42 · 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
36.1 °C
11 July 2023
Coldest day
-48.8 °C
31 December 1978
Wettest day
52 mm
27 July 1979
Windiest day
45.2 km/h
20 October 1973
Strongest gust
99.7 km/h
20 October 1973
Hottest feels-like
38.9 °C
29 June 1954
Coldest feels-like
-53.9 °C
31 December 1978
Snowiest day
19.0 cm
28 April 2025
Sunniest day
17.0 h
29 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 | -4.1 °C | +7.0 °C | 87 mm | +46 mm |
| Feb | -6.0 °C | +3.4 °C | 17 mm | -14 mm |
| Mar | 2.4 °C | +4.4 °C | 33 mm | -4 mm |
| Apr | 10.1 °C | +2.6 °C | 83 mm | +44 mm |
| May | 18.0 °C | +1.8 °C | 57 mm | +7 mm |
| Jun | 22.0 °C | +1.0 °C | 92 mm | +28 mm |
| Jul | 22.0 °C | -1.1 °C | 44 mm | -27 mm |
| Aug | 21.8 °C | +1.2 °C | 112 mm | +51 mm |
| Sep | 15.5 °C | +1.4 °C | 49 mm | -16 mm |
| Oct | 8.7 °C | +3.5 °C | 38 mm | -28 mm |
| Nov | 2.6 °C | +5.7 °C | 108 mm | +54 mm |
| Dec | -6.8 °C | +1.8 °C | 75 mm | +27 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 Osa?
Osa has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 2.5 °C and it receives 629 mm of precipitation per year.
What is the hottest day ever recorded in Osa?
The hottest day measured in Osa between 1940 and 2025 was 11 July 2023, reaching 36.1 °C.
What is the coldest day in Osa?
The coldest day measured in Osa between 1940 and 2025 was 31 December 1978, at -48.8 °C.
Does it snow in Osa?
Yes. Osa gets on average 172.6 cm of snow per year and has around 180 frost days.
Has the climate of Osa warmed?
Yes: Osa warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Osa?
The wettest day measured in Osa between 1940 and 2025 was 27 July 1979, with 52 mm of rain in 24 hours.
What was the windiest day in Osa?
The windiest day measured in Osa between 1940 and 2025 was 20 October 1973, with winds reaching 45.2 km/h.
What is the warmest month in Osa?
The warmest month in Osa is July (18.6 °C on average); the coldest is January (-13.9 °C).
How much does it rain in Osa?
Osa receives on average 629 mm of precipitation per year, spread over about 135 rainy days.
Is it sunny in Osa?
Osa gets on average 7.0 hours of sunshine per day, roughly 2,555 hours per year over 1940-2025.
What is the biggest single-day snowfall in Osa?
The heaviest 24-hour snowfall measured in Osa between 1940 and 2025 was 28 April 2025, with 19.0 cm.
Are there tropical nights in Osa?
Yes: Osa has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Osa?
In Osa, between 1940 and 2025, the highest apparent temperature reached 38.9 °C on 29 June 1954, and the lowest was -53.9 °C on 31 December 1978.
Compare Osa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Osa