Rock Springs weather by month
Measured at Rock Springs/SW Wyoming Rgnl
Averages and records for each calendar month at Rock Springs/SW Wyoming Rgnl, United States, from 1948 to 2026. The warmest month is July, averaging 28.9°C; the coolest is January at −1.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.3°C | −11.3°C | 12.8°C7 January 1969 | −38.3°C12 January 1963 | 77 / 78 |
| February | 0.9°C | −9.6°C | 15.6°C20 February 1977 | −33.9°C7 February 1989 | 78 / 78 |
| March | 5.8°C | −5.7°C | 25.6°C25 March 2026 | −24.4°C11 March 1969 | 77 / 77 |
| April | 11.7°C | −1.8°C | 26.1°C20 April 1989 | −16.7°C2 April 1975 | 77 / 77 |
| May | 17.6°C | 3.1°C | 32.2°C31 May 2002 | −10.0°C1 May 1967 | 77 / 77 |
| June | 24.1°C | 8.0°C | 35.6°C23 June 1954 | −3.3°C2 June 1951 | 77 / 77 |
| July | 28.9°C | 12.1°C | 36.7°C13 July 2002 | 1.7°C1 July 1968 | 77 / 78 |
| August | 27.5°C | 11.0°C | 36.1°C2 August 2026 | 0.6°C31 August 1962 | 76 / 76 |
| September | 21.8°C | 5.9°C | 33.9°C4 September 2022 | −15.0°C18 September 1965 | 76 / 78 |
| October | 14.0°C | 0.1°C | 28.3°C23 October 2007 | −23.2°C26 October 2020 | 76 / 76 |
| November | 5.0°C | −6.2°C | 18.9°C4 November 1977 | −25.0°C27 November 1976 | 77 / 77 |
| December | −0.5°C | −10.5°C | 15.0°C22 December 2025 | −33.9°C31 December 1978 | 77 / 77 |
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 76 to 78 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.