Ust'-Ilimsk climate — normals and trends
Ust'-Ilimsk (Russia) has a subarctic climate (Dfc) under the Köppen-Geiger classification. Its mean annual temperature is -2.5 °C and it receives 472 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 (18.3 °C on average) and the coldest is January (-23.6 °C). Rainfall peaks in July.
Ust'-Ilimsk averages 222 frost days, 2 hot days (≥ 30 °C) and 117 rainy days per year.
Ust'-Ilimsk has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 228 to 216 per year over the period.
The hottest day of the period reached 35.3 °C (on 2 July 2019) and the coldest -55.7 °C (on 2 January 1951).
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
Ust'-IlimskIrkutsk Oblast
- coords
- 58.00°, 102.66°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
-2.5°C
Average daily high
1.9°C
Average daily low
-7.3°C
Annual rainfall
472mm
Sunshine / day
8.0h
Mean relative humidity
72%
Average peak wind
15.4km/h
Seasonal range
41.9°C
Frost days (< 0 °C)
222 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
117 d/yr
Annual snowfall
135.0 cm
Average feels-like high
-1.8 °C
Average feels-like low
-11.3 °C
Average peak gust
33.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.26 · 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
35.3 °C
2 July 2019
Coldest day
-55.7 °C
2 January 1951
Wettest day
59 mm
28 July 1960
Windiest day
40.6 km/h
25 March 2015
Strongest gust
93.6 km/h
28 April 1999
Hottest feels-like
38.0 °C
22 July 2002
Coldest feels-like
-60.4 °C
2 January 1951
Snowiest day
13.0 cm
11 September 1965
Sunniest day
17.5 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 | -13.1 °C | +6.9 °C | 23 mm | +6 mm |
| Feb | -14.1 °C | +1.6 °C | 29 mm | +16 mm |
| Mar | -1.8 °C | +3.4 °C | 55 mm | +35 mm |
| Apr | 4.8 °C | +1.2 °C | 53 mm | +22 mm |
| May | 14.2 °C | +1.9 °C | 52 mm | +5 mm |
| Jun | 21.8 °C | +1.3 °C | 92 mm | +33 mm |
| Jul | 22.7 °C | -0.5 °C | 38 mm | -31 mm |
| Aug | 21.5 °C | +1.6 °C | 37 mm | -25 mm |
| Sep | 13.4 °C | +1.5 °C | 86 mm | +36 mm |
| Oct | -0.2 °C | -2.0 °C | 24 mm | -19 mm |
| Nov | -6.3 °C | +4.1 °C | 58 mm | +22 mm |
| Dec | -18.7 °C | -0.1 °C | 37 mm | +12 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 Ust'-Ilimsk?
Ust'-Ilimsk has a subarctic climate (Köppen Dfc). Over 1940-2025, the average annual temperature is -2.5 °C and it receives 472 mm of precipitation per year.
What is the hottest day ever recorded in Ust'-Ilimsk?
The hottest day measured in Ust'-Ilimsk between 1940 and 2025 was 2 July 2019, reaching 35.3 °C.
What is the coldest day in Ust'-Ilimsk?
The coldest day measured in Ust'-Ilimsk between 1940 and 2025 was 2 January 1951, at -55.7 °C.
Does it snow in Ust'-Ilimsk?
Yes. Ust'-Ilimsk gets on average 135.0 cm of snow per year and has around 222 frost days.
Has the climate of Ust'-Ilimsk warmed?
Yes: Ust'-Ilimsk warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ust'-Ilimsk?
The wettest day measured in Ust'-Ilimsk between 1940 and 2025 was 28 July 1960, with 59 mm of rain in 24 hours.
What was the windiest day in Ust'-Ilimsk?
The windiest day measured in Ust'-Ilimsk between 1940 and 2025 was 25 March 2015, with winds reaching 40.6 km/h.
What is the warmest month in Ust'-Ilimsk?
The warmest month in Ust'-Ilimsk is July (18.3 °C on average); the coldest is January (-23.6 °C).
How much does it rain in Ust'-Ilimsk?
Ust'-Ilimsk receives on average 472 mm of precipitation per year, spread over about 117 rainy days.
Is it sunny in Ust'-Ilimsk?
Ust'-Ilimsk gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ust'-Ilimsk?
The heaviest 24-hour snowfall measured in Ust'-Ilimsk between 1940 and 2025 was 11 September 1965, with 13.0 cm.
Are there tropical nights in Ust'-Ilimsk?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ust'-Ilimsk.
What was the most extreme apparent temperature in Ust'-Ilimsk?
In Ust'-Ilimsk, between 1940 and 2025, the highest apparent temperature reached 38.0 °C on 22 July 2002, and the lowest was -60.4 °C on 2 January 1951.
Compare Ust'-Ilimsk with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ust'-Ilimsk