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 78°F, while the coldest is January averaging around −7°F at night. Precipitation totals about 19 inches a year and is strongly seasonal — July alone averages 4.2 inches while February barely receives 0.37 inches. At latitude 52°N, day length swings from 7.5 hours in midwinter to 16.5 hours at midsummer.

☀️ Summers

Warm

Highs near 78°F in July.

About 2 days a year above 90 °F

❄️ Winters

Bitterly cold

Lows near −7°F in January.

About 194 freezing nights a year

🌧️ Rain

Fairly dry

About 19 in of rain a year.

Wettest in July

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.4 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Irkutsk climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	9	18	34	51	65	75	78	73	61	46	27	13
Avg temp (°F)	1	8	23	39	52	62	67	63	50	37	19	5
Avg low (°F)	−7	−2	11	28	39	50	56	52	40	28	11	−2
Precipitation (in)	0.6	0.4	0.5	0.8	1.4	2.7	4.2	3.8	2.1	0.8	0.8	0.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	9	18	34	51	65	75
Avg temp (°F)	1	8	23	39	52	62
Avg low (°F)	−7	−2	11	28	39	50
Precipitation (in)	0.6	0.4	0.5	0.8	1.4	2.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	78	73	61	46	27	13
Avg temp (°F)	67	63	50	37	19	5
Avg low (°F)	56	52	40	28	11	−2
Precipitation (in)	4.2	3.8	2.1	0.8	0.8	0.7

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 ≥ 90°F (days)	—	—	—	—	0.1	0.8	1	0.2	—	—	—	—
Days with low ≤ 32°F (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 ≥ 90°F (days)	—	—	—	—	0.1	0.8
Days with low ≤ 32°F (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 ≥ 90°F (days)	1	0.2	—	—	—	—
Days with low ≤ 32°F (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.

How we build these numbers →