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Irkutsk, Russia climate
Dwb Monsoon-influenced warm-summer humid continental
Irkutsk has a strongly seasonal cold-temperate climate (Monsoon-influenced warm-summer humid continental, Köppen Dwb). The hottest month is July with an average daily high near 26°C, while the coldest is January averaging around −22°C at night. Precipitation totals about 476 mm a year and is strongly seasonal — July alone averages 106 mm while February barely receives 9 mm. At latitude 52°N, day length swings from 7.5 hours in midwinter to 16.5 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsIrkutsk climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | −13 | −8 | 1 | 10 | 18 | 24 | 26 | 23 | 16 | 8 | −3 | −11 |
| Avg temp (°C) | −17 | −13 | −5 | 4 | 11 | 17 | 20 | 17 | 10 | 3 | −7 | −15 |
| Avg low (°C) | −22 | −19 | −11 | −2 | 4 | 10 | 13 | 11 | 4 | −2 | −12 | −19 |
| Precipitation (mm) | 15 | 9 | 12 | 21 | 36 | 69 | 106 | 95 | 52 | 21 | 20 | 19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | −13 | −8 | 1 | 10 | 18 | 24 |
| Avg temp (°C) | −17 | −13 | −5 | 4 | 11 | 17 |
| Avg low (°C) | −22 | −19 | −11 | −2 | 4 | 10 |
| Precipitation (mm) | 15 | 9 | 12 | 21 | 36 | 69 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 23 | 16 | 8 | −3 | −11 |
| Avg temp (°C) | 20 | 17 | 10 | 3 | −7 | −15 |
| Avg low (°C) | 13 | 11 | 4 | −2 | −12 | −19 |
| Precipitation (mm) | 106 | 95 | 52 | 21 | 20 | 19 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 8 | 7 | 7 | 9 | 12 | 13 | 12 | 11 | 8 | 12 | 14 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.8 | 1 | 0.2 | — | — | — | — |
| Days with low ≤ 0°C (days) | 30 | 27 | 29 | 21 | 6 | 0.1 | — | 0.0 | 3 | 21 | 28 | 29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 8 | 7 | 7 | 9 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.1 | 0.8 |
| Days with low ≤ 0°C (days) | 30 | 27 | 29 | 21 | 6 | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 13 | 12 | 11 | 8 | 12 | 14 |
| Days with high ≥ 32°C (days) | 1 | 0.2 | — | — | — | — |
| Days with low ≤ 0°C (days) | — | 0.0 | 3 | 21 | 28 | 29 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 55 | 59 | 69 | 70 | 70 | 68 | 66 | 68 | 72 | 75 | 73 |
| Clear days (≤ 30% cloud) | 4 | 6 | 6 | 2 | 3 | 3 | 4 | 5 | 4 | 4 | 1 | 1 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 10 | 11 | 10 | 10 | 9 | 9 | 8 | 9 | 11 |
| Cloudy days (≥ 70%) | 13 | 10 | 12 | 17 | 18 | 17 | 17 | 16 | 17 | 19 | 20 | 19 |
| Relative humidity (%) | 96 | 95 | 86 | 64 | 60 | 60 | 63 | 67 | 71 | 75 | 84 | 94 |
| Wind speed (mph) | 3.8 | 4.1 | 4.7 | 5.7 | 5.3 | 4.4 | 3.8 | 4.0 | 4.3 | 4.1 | 4.2 | 3.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 55 | 59 | 69 | 70 | 70 |
| Clear days (≤ 30% cloud) | 4 | 6 | 6 | 2 | 3 | 3 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 10 | 11 | 10 |
| Cloudy days (≥ 70%) | 13 | 10 | 12 | 17 | 18 | 17 |
| Relative humidity (%) | 96 | 95 | 86 | 64 | 60 | 60 |
| Wind speed (mph) | 3.8 | 4.1 | 4.7 | 5.7 | 5.3 | 4.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 66 | 68 | 72 | 75 | 73 |
| Clear days (≤ 30% cloud) | 4 | 5 | 4 | 4 | 1 | 1 |
| Partly cloudy days (30–70%) | 10 | 9 | 9 | 8 | 9 | 11 |
| Cloudy days (≥ 70%) | 17 | 16 | 17 | 19 | 20 | 19 |
| Relative humidity (%) | 63 | 67 | 71 | 75 | 84 | 94 |
| Wind speed (mph) | 3.8 | 4.0 | 4.3 | 4.1 | 4.2 | 3.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Irkutsk, a weather station, about 5 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.