Custer Cnty Arpt climate by month
Averages and records for each calendar month at Custer Cnty Arpt, United States, from 1999 to 2026. The warmest month is July, averaging 27.0°C; the coolest is February at 1.5°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.0°C | −9.6°C | 18.3°C27 January 2015 | −34.3°C14 January 2024 | 26 / 26 |
| February | 1.5°C | −10.5°C | 16.1°C18 February 2016 | −33.8°C18 February 2006 | 26 / 26 |
| March | 6.8°C | −5.6°C | 25.6°C21 March 2026 | −26.7°C2 March 2002 | 26 / 26 |
| April | 10.3°C | −2.5°C | 27.2°C24 April 2012 | −19.9°C7 April 2007 | 27 / 27 |
| May | 15.5°C | 2.5°C | 31.1°C29 May 2003 | −11.1°C2 May 2005 | 27 / 27 |
| June | 22.3°C | 8.1°C | 35.6°C26 June 2012 | −1.1°C2 June 2000 | 27 / 27 |
| July | 27.0°C | 12.1°C | 37.2°C30 July 2006 | 2.8°C30 July 2009 | 27 / 27 |
| August | 25.9°C | 10.6°C | 35.0°C13 August 2007 | −0.5°C31 August 2020 | 27 / 27 |
| September | 21.3°C | 6.2°C | 34.4°C5 September 2020 | −6.0°C9 September 2020 | 26 / 27 |
| October | 12.7°C | −0.4°C | 27.8°C1 October 2005 | −23.2°C26 October 2020 | 26 / 26 |
| November | 7.0°C | −5.2°C | 22.8°C3 November 2020 | −23.9°C30 November 2025 | 26 / 26 |
| December | 2.1°C | −9.3°C | 17.2°C8 December 2020 | −36.0°C22 December 2022 | 26 / 27 |
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 26 to 27 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.