Irkutsk climate — normals and trends
Irkutsk (Russia) has a warm-summer humid continental, dry winter climate (Dwb) under the Köppen-Geiger classification. Its mean annual temperature is 0.1 °C and it receives 470 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 (17.8 °C on average) and the coldest is January (-20.4 °C). Rainfall peaks in July.
Irkutsk averages 204 frost days, 1 hot days (≥ 30 °C) and 86 rainy days per year.
Irkutsk has warmed by +1.8 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 209 to 199 per year over the period.
The hottest day of the period reached 35.7 °C (on 22 June 2010) and the coldest -45.0 °C (on 2 February 2006).
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
IrkutskIrkutsk Oblast
- coords
- 52.30°, 104.29°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
0.1°C
Average daily high
5.3°C
Average daily low
-4.7°C
Annual rainfall
470mm
Sunshine / day
9.1h
Mean relative humidity
73%
Average peak wind
13.8km/h
Seasonal range
38.2°C
Frost days (< 0 °C)
204 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
86 d/yr
Annual snowfall
69.8 cm
Average feels-like high
2.3 °C
Average feels-like low
-8.2 °C
Average peak gust
29.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.32 · 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
35.7 °C
22 June 2010
Coldest day
-45.0 °C
2 February 2006
Wettest day
90 mm
7 July 2001
Windiest day
42.7 km/h
16 May 1990
Strongest gust
93.2 km/h
16 May 1990
Hottest feels-like
37.6 °C
16 July 2004
Coldest feels-like
-50.4 °C
2 February 2006
Snowiest day
20.0 cm
1 October 1974
Sunniest day
16.0 h
25 May 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 | -10.7 °C | +5.0 °C | 7 mm | +0 mm |
| Feb | -9.9 °C | +1.1 °C | 6 mm | +0 mm |
| Mar | 2.0 °C | +3.3 °C | 14 mm | +2 mm |
| Apr | 11.1 °C | +3.5 °C | 25 mm | +1 mm |
| May | 17.7 °C | +2.6 °C | 24 mm | -17 mm |
| Jun | 22.9 °C | +2.0 °C | 42 mm | -29 mm |
| Jul | 24.1 °C | +1.3 °C | 76 mm | -26 mm |
| Aug | 22.0 °C | +1.0 °C | 122 mm | +28 mm |
| Sep | 17.4 °C | +2.3 °C | 29 mm | -30 mm |
| Oct | 3.2 °C | -3.6 °C | 40 mm | +12 mm |
| Nov | -0.5 °C | +3.9 °C | 25 mm | +9 mm |
| Dec | -13.2 °C | +0.3 °C | 10 mm | -2 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 Irkutsk?
Irkutsk has a warm-summer humid continental, dry winter climate (Köppen Dwb). Over 1940-2025, the average annual temperature is 0.1 °C and it receives 470 mm of precipitation per year.
What is the hottest day ever recorded in Irkutsk?
The hottest day measured in Irkutsk between 1940 and 2025 was 22 June 2010, reaching 35.7 °C.
What is the coldest day in Irkutsk?
The coldest day measured in Irkutsk between 1940 and 2025 was 2 February 2006, at -45.0 °C.
Does it snow in Irkutsk?
Yes. Irkutsk gets on average 69.8 cm of snow per year and has around 204 frost days.
Has the climate of Irkutsk warmed?
Yes: Irkutsk warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Irkutsk?
The wettest day measured in Irkutsk between 1940 and 2025 was 7 July 2001, with 90 mm of rain in 24 hours.
What was the windiest day in Irkutsk?
The windiest day measured in Irkutsk between 1940 and 2025 was 16 May 1990, with winds reaching 42.7 km/h.
What is the warmest month in Irkutsk?
The warmest month in Irkutsk is July (17.8 °C on average); the coldest is January (-20.4 °C).
How much does it rain in Irkutsk?
Irkutsk receives on average 470 mm of precipitation per year, spread over about 86 rainy days.
Is it sunny in Irkutsk?
Irkutsk gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Irkutsk?
The heaviest 24-hour snowfall measured in Irkutsk between 1940 and 2025 was 1 October 1974, with 20.0 cm.
Are there tropical nights in Irkutsk?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Irkutsk.
What was the most extreme apparent temperature in Irkutsk?
In Irkutsk, between 1940 and 2025, the highest apparent temperature reached 37.6 °C on 16 July 2004, and the lowest was -50.4 °C on 2 February 2006.
Compare Irkutsk with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Irkutsk