Sayansk climate — normals and trends
Sayansk (Russia) has a dry-winter subarctic climate (Dwc) under the Köppen-Geiger classification. Its mean annual temperature is -0.8 °C and it receives 422 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 (-22.0 °C). Rainfall peaks in July.
Sayansk averages 216 frost days, 5 hot days (≥ 30 °C) and 90 rainy days per year.
Sayansk has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 221 to 211 per year over the period.
The hottest day of the period reached 36.5 °C (on 21 June 1991) and the coldest -50.3 °C (on 8 January 2001).
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
SayanskIrkutsk Oblast
- coords
- 54.11°, 102.18°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
-0.8°C
Average daily high
4.6°C
Average daily low
-6.0°C
Annual rainfall
422mm
Sunshine / day
8.8h
Mean relative humidity
71%
Average peak wind
14.1km/h
Seasonal range
40.6°C
Frost days (< 0 °C)
216 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
90 d/yr
Annual snowfall
70.3 cm
Average feels-like high
1.3 °C
Average feels-like low
-9.8 °C
Average peak gust
31.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °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
36.5 °C
21 June 1991
Coldest day
-50.3 °C
8 January 2001
Wettest day
69 mm
30 July 1980
Windiest day
41.8 km/h
16 May 1990
Strongest gust
98.6 km/h
16 May 1990
Hottest feels-like
37.4 °C
23 July 2002
Coldest feels-like
-55.4 °C
8 January 2001
Snowiest day
10.9 cm
20 April 1964
Sunniest day
16.2 h
19 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -11.8 °C | +5.9 °C | 13 mm | +5 mm |
| Feb | -10.8 °C | +1.7 °C | 12 mm | +5 mm |
| Mar | 1.4 °C | +3.9 °C | 18 mm | +7 mm |
| Apr | 10.9 °C | +3.7 °C | 30 mm | +6 mm |
| May | 17.9 °C | +2.1 °C | 35 mm | -6 mm |
| Jun | 24.4 °C | +2.0 °C | 45 mm | -19 mm |
| Jul | 24.9 °C | +0.8 °C | 62 mm | -25 mm |
| Aug | 22.0 °C | +0.6 °C | 102 mm | +24 mm |
| Sep | 16.7 °C | +2.5 °C | 21 mm | -28 mm |
| Oct | 1.1 °C | -3.9 °C | 33 mm | +11 mm |
| Nov | -2.2 °C | +4.9 °C | 24 mm | +7 mm |
| Dec | -15.2 °C | +0.4 °C | 16 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 Sayansk?
Sayansk has a dry-winter subarctic climate (Köppen Dwc). Over 1940-2025, the average annual temperature is -0.8 °C and it receives 422 mm of precipitation per year.
What is the hottest day ever recorded in Sayansk?
The hottest day measured in Sayansk between 1940 and 2025 was 21 June 1991, reaching 36.5 °C.
What is the coldest day in Sayansk?
The coldest day measured in Sayansk between 1940 and 2025 was 8 January 2001, at -50.3 °C.
Does it snow in Sayansk?
Yes. Sayansk gets on average 70.3 cm of snow per year and has around 216 frost days.
Has the climate of Sayansk warmed?
Yes: Sayansk warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sayansk?
The wettest day measured in Sayansk between 1940 and 2025 was 30 July 1980, with 69 mm of rain in 24 hours.
What was the windiest day in Sayansk?
The windiest day measured in Sayansk between 1940 and 2025 was 16 May 1990, with winds reaching 41.8 km/h.
What is the warmest month in Sayansk?
The warmest month in Sayansk is July (18.6 °C on average); the coldest is January (-22.0 °C).
How much does it rain in Sayansk?
Sayansk receives on average 422 mm of precipitation per year, spread over about 90 rainy days.
Is it sunny in Sayansk?
Sayansk gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sayansk?
The heaviest 24-hour snowfall measured in Sayansk between 1940 and 2025 was 20 April 1964, with 10.9 cm.
Are there tropical nights in Sayansk?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sayansk.
What was the most extreme apparent temperature in Sayansk?
In Sayansk, between 1940 and 2025, the highest apparent temperature reached 37.4 °C on 23 July 2002, and the lowest was -55.4 °C on 8 January 2001.
Compare Sayansk with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sayansk