Casper/Natrona Cnty climate by month
Averages and records for each calendar month at Casper/Natrona Cnty, United States, from 1948 to 2026. The warmest month is July, averaging 31.3°C; the coolest is January at 1.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 1.1°C | −10.3°C | 15.6°C30 January 1971 | −40.0°C24 January 1949 | 78 / 78 |
| February | 3.1°C | −9.0°C | 20.0°C21 February 1982 | −35.6°C17 February 2006 | 78 / 78 |
| March | 8.1°C | −5.6°C | 28.3°C21 March 2026 | −31.6°C10 March 2022 | 78 / 78 |
| April | 13.4°C | −1.7°C | 28.9°C30 April 1992 | −21.1°C12 April 1997 | 78 / 78 |
| May | 19.2°C | 3.4°C | 35.0°C29 May 2003 | −8.9°C12 May 1953 | 78 / 78 |
| June | 26.2°C | 8.2°C | 38.9°C24 June 1988 | −3.8°C10 June 2019 | 78 / 78 |
| July | 31.3°C | 12.2°C | 40.0°C12 July 1954 | −1.1°C4 July 1972 | 78 / 78 |
| August | 30.1°C | 11.3°C | 39.4°C2 August 2026 | −1.6°C23 August 2015 | 79 / 79 |
| September | 24.0°C | 5.9°C | 37.8°C4 September 2022 | −8.9°C20 September 1983 | 78 / 79 |
| October | 15.9°C | 0.1°C | 30.6°C1 October 1992 | −22.7°C29 October 2019 | 78 / 78 |
| November | 7.3°C | −5.4°C | 22.8°C4 November 2020 | −32.7°C12 November 2014 | 78 / 78 |
| December | 1.9°C | −9.3°C | 18.9°C2 December 2021 | −41.0°C22 December 2022 | 78 / 78 |
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 78 to 79 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.