Onega climate — normals and trends
Onega (Russia) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is 1.4 °C and it receives 635 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 (14.1 °C on average) and the coldest is January (-10.8 °C). Rainfall peaks in September.
Onega averages 188 frost days, 0 hot days (≥ 30 °C) and 139 rainy days per year.
Onega has warmed by +3.6 °C between 1940 and 2025, or +0.42 °C per decade. This trend is statistically significant.
The number of frost days there went from about 209 to 167 per year over the period.
The hottest day of the period reached 30.1 °C (on 28 July 2010) and the coldest -38.0 °C (on 14 January 1940).
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
OnegaArkhangelskaya oblast
- coords
- 63.91°, 38.10°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
1.4°C
Average daily high
3.7°C
Average daily low
-1.0°C
Annual rainfall
635mm
Sunshine / day
6.9h
Mean relative humidity
81%
Average peak wind
21.2km/h
Seasonal range
24.9°C
Frost days (< 0 °C)
188 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
139 d/yr
Annual snowfall
164.9 cm
Average feels-like high
-0.3 °C
Average feels-like low
-5.5 °C
Average peak gust
34.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
8.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.6 °C
since 1940
+0.4 °C per decade · r² = 0.48 · 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
30.1 °C
28 July 2010
Coldest day
-38.0 °C
14 January 1940
Wettest day
49 mm
19 August 1949
Windiest day
55.3 km/h
2 June 1962
Strongest gust
91.8 km/h
2 October 1994
Hottest feels-like
32.1 °C
28 July 2010
Coldest feels-like
-45.2 °C
14 January 1940
Snowiest day
16.5 cm
20 April 1997
Sunniest day
19.1 h
4 July 2021
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 | -3.8 °C | +4.9 °C | 75 mm | +39 mm |
| Feb | -4.4 °C | +3.9 °C | 9 mm | -18 mm |
| Mar | 0.1 °C | +3.7 °C | 57 mm | +26 mm |
| Apr | 3.6 °C | +1.2 °C | 25 mm | -12 mm |
| May | 11.0 °C | +2.9 °C | 56 mm | +10 mm |
| Jun | 14.9 °C | +1.7 °C | 58 mm | +2 mm |
| Jul | 20.3 °C | +3.4 °C | 62 mm | +1 mm |
| Aug | 18.6 °C | +2.5 °C | 92 mm | +15 mm |
| Sep | 15.5 °C | +4.7 °C | 57 mm | -24 mm |
| Oct | 6.9 °C | +3.1 °C | 57 mm | -19 mm |
| Nov | 1.6 °C | +3.0 °C | 91 mm | +32 mm |
| Dec | -1.8 °C | +3.5 °C | 80 mm | +33 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 Onega?
Onega has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is 1.4 °C and it receives 635 mm of precipitation per year.
What is the hottest day ever recorded in Onega?
The hottest day measured in Onega between 1940 and 2025 was 28 July 2010, reaching 30.1 °C.
What is the coldest day in Onega?
The coldest day measured in Onega between 1940 and 2025 was 14 January 1940, at -38.0 °C.
Does it snow in Onega?
Yes. Onega gets on average 164.9 cm of snow per year and has around 188 frost days.
Has the climate of Onega warmed?
Yes: Onega warmed by +3.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Onega?
The wettest day measured in Onega between 1940 and 2025 was 19 August 1949, with 49 mm of rain in 24 hours.
What was the windiest day in Onega?
The windiest day measured in Onega between 1940 and 2025 was 2 June 1962, with winds reaching 55.3 km/h.
What is the warmest month in Onega?
The warmest month in Onega is July (14.1 °C on average); the coldest is January (-10.8 °C).
How much does it rain in Onega?
Onega receives on average 635 mm of precipitation per year, spread over about 139 rainy days.
Is it sunny in Onega?
Onega 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 Onega?
The heaviest 24-hour snowfall measured in Onega between 1940 and 2025 was 20 April 1997, with 16.5 cm.
Are there tropical nights in Onega?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Onega.
What was the most extreme apparent temperature in Onega?
In Onega, between 1940 and 2025, the highest apparent temperature reached 32.1 °C on 28 July 2010, and the lowest was -45.2 °C on 14 January 1940.
Compare Onega with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Onega