Irkutsk Intl climate by month
Averages and records for each calendar month at Irkutsk Intl, Russia, from 1887 to 2025. The warmest month is July, averaging 24.9°C; the coolest is January at −14.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −14.5°C | −24.6°C | 2.3°C2 January 1927 | −49.7°C12 January 1915 | 130 / 139 |
| February | −10.0°C | −22.7°C | 10.2°C28 February 1987 | −44.7°C1 February 1929 | 131 / 139 |
| March | −1.1°C | −15.0°C | 21.1°C30 March 2023 | −37.3°C1 March 1933 | 134 / 139 |
| April | 8.4°C | −4.3°C | 29.2°C29 April 1899 | −31.8°C1 April 1909 | 134 / 139 |
| May | 16.7°C | 1.9°C | 34.5°C16 May 1990 | −14.3°C1 May 1908 | 131 / 139 |
| June | 22.9°C | 8.1°C | 35.6°C22 June 2010 | −6.0°C8 June 1909 | 134 / 139 |
| July | 24.9°C | 11.8°C | 37.2°C24 July 1915 | 0.4°C11 July 1890 | 136 / 139 |
| August | 22.1°C | 9.7°C | 34.7°C8 August 2015 | −2.7°C25 August 1902 | 134 / 139 |
| September | 15.5°C | 3.0°C | 29.7°C13 September 2015 | −11.9°C27 September 1922 | 131 / 138 |
| October | 7.2°C | −4.0°C | 25.6°C18 October 1946 | −30.5°C30 October 1901 | 131 / 138 |
| November | −4.2°C | −14.4°C | 14.4°C3 November 2013 | −40.4°C27 November 1910 | 130 / 138 |
| December | −12.5°C | −22.0°C | 5.3°C2 December 2013 | −46.3°C22 December 1916 | 132 / 138 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 130 to 136 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.