Semnan climate by month
Averages and records for each calendar month at Semnan, Iran, from 1973 to 2025. The warmest month is July, averaging 38.5°C; the coolest is January at 9.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 9.5°C | −0.2°C | 22.0°C6 January 1976 | −12.6°C16 January 2008 | 21 / 43 |
| February | 12.3°C | 3.4°C | 26.4°C23 February 2016 | −8.8°C12 February 2020 | 17 / 39 |
| March | 19.0°C | 8.1°C | 31.0°C30 March 2008 | −5.6°C12 March 2012 | 19 / 40 |
| April | 25.0°C | 13.1°C | 35.4°C30 April 2008 | 0.0°C20 April 1973 | 19 / 37 |
| May | 30.8°C | 19.1°C | 38.6°C20 May 2025 | 5.0°C2 May 1974 | 20 / 39 |
| June | 36.6°C | 24.0°C | 43.0°C28 June 2022 | 12.0°C3 June 1978 | 19 / 40 |
| July | 38.5°C | 26.8°C | 44.4°C8 July 2021 | 16.8°C12 July 2004 | 20 / 40 |
| August | 37.2°C | 24.7°C | 43.8°C8 August 2024 | 16.0°C8 August 1977 | 20 / 38 |
| September | 33.3°C | 20.8°C | 39.6°C9 September 1991 | 9.0°C27 September 1973 | 23 / 40 |
| October | 25.8°C | 13.7°C | 34.4°C3 October 2010 | 2.0°C24 October 1977 | 19 / 40 |
| November | 16.6°C | 7.0°C | 27.2°C1 November 2017 | −9.0°C25 November 2016 | 20 / 38 |
| December | 11.0°C | 2.1°C | 20.2°C3 December 2010 | −10.2°C18 December 2007 | 19 / 40 |
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 17 to 23 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.