Greybull/South Big Horn Arpt climate by month
Averages and records for each calendar month at Greybull/South Big Horn Arpt, United States, from 1998 to 2026. The warmest month is July, averaging 33.7°C; the coolest is January at −0.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.7°C | −14.2°C | 13.3°C31 January 2024 | −38.2°C27 January 2009 | 26 / 27 |
| February | 1.9°C | −12.1°C | 20.6°C28 February 2006 | −34.9°C2 February 2011 | 27 / 27 |
| March | 11.1°C | −4.2°C | 29.4°C21 March 2026 | −31.0°C4 March 2019 | 27 / 27 |
| April | 15.6°C | 0.5°C | 31.1°C29 April 2007 | −14.9°C21 April 2008 | 26 / 27 |
| May | 21.2°C | 6.2°C | 36.7°C29 May 2003 | −6.7°C9 May 2002 | 27 / 27 |
| June | 28.1°C | 11.4°C | 42.2°C15 June 2021 | 0.0°C7 June 2009 | 27 / 27 |
| July | 33.7°C | 15.1°C | 42.2°C13 July 2002 | 6.7°C12 July 2008 | 26 / 27 |
| August | 31.8°C | 13.2°C | 40.6°C3 August 2001 | 2.2°C31 August 2005 | 27 / 27 |
| September | 25.5°C | 7.4°C | 39.4°C4 September 2022 | −2.8°C29 September 1999 | 26 / 27 |
| October | 15.7°C | 0.3°C | 32.8°C1 October 2011 | −22.1°C26 October 2020 | 26 / 27 |
| November | 7.4°C | −6.8°C | 22.8°C4 November 1999 | −27.7°C30 November 2006 | 27 / 27 |
| December | 0.1°C | −13.1°C | 18.3°C24 December 2025 | −37.7°C22 December 2022 | 27 / 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 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.