Challis Arpt climate by month
Averages and records for each calendar month at Challis Arpt, United States, from 1998 to 2026. The warmest month is July, averaging 31.6°C; the coolest is January at −1.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.2°C | −12.7°C | 13.3°C31 January 2003 | −35.5°C15 January 2017 | 26 / 28 |
| February | 2.5°C | −9.6°C | 16.1°C6 February 2015 | −27.7°C12 February 2025 | 27 / 28 |
| March | 9.5°C | −4.4°C | 23.9°C19 March 2026 | −18.9°C2 March 2002 | 28 / 28 |
| April | 14.1°C | −1.2°C | 28.3°C22 April 2012 | −11.6°C1 April 2008 | 27 / 28 |
| May | 19.5°C | 3.6°C | 35.6°C28 May 2003 | −6.7°C8 May 2002 | 27 / 28 |
| June | 25.2°C | 7.4°C | 37.8°C28 June 2015 | −1.6°C7 June 2012 | 28 / 28 |
| July | 31.6°C | 10.9°C | 39.4°C12 July 2002 | 2.2°C5 July 1999 | 28 / 28 |
| August | 29.8°C | 9.5°C | 38.9°C10 August 2018 | 0.6°C31 August 2006 | 28 / 28 |
| September | 24.1°C | 5.0°C | 37.2°C3 September 2022 | −7.2°C28 September 1999 | 27 / 29 |
| October | 15.3°C | −0.7°C | 28.9°C3 October 2010 | −20.0°C31 October 2002 | 28 / 28 |
| November | 5.9°C | −6.6°C | 22.2°C7 November 2006 | −24.3°C16 November 2014 | 28 / 28 |
| December | −1.0°C | −11.9°C | 17.2°C2 December 2021 | −30.5°C18 December 2016 | 28 / 28 |
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 28 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.