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July is the hottest month in Cheyenne WY, with an average high of 84°F / 29°C; December is the coldest (39°F / 4°C). May is the wettest month, averaging 2.4 in / 62 mm of precipitation.
| Month | High °F / °C | Low °F / °C | Precip in / mm | Wet days |
|---|---|---|---|---|
| Jan | 40 / 4 | 18 / -8 | 0.4 / 9 | 3 |
| Feb | 41 / 5 | 18 / -8 | 0.5 / 13 | 4 |
| Mar | 49 / 10 | 25 / -4 | 0.9 / 24 | 5 |
| Apr | 55 / 13 | 31 / -1 | 1.8 / 45 | 7 |
| May | 64 / 18 | 40 / 4 | 2.4 / 62 | 9 |
| Jun | 77 / 25 | 49 / 10 | 2.2 / 55 | 7 |
| Jul | 84 / 29 | 56 / 13 | 2.1 / 54 | 7 |
| Aug | 82 / 28 | 54 / 12 | 1.5 / 39 | 6 |
| Sep | 73 / 23 | 46 / 8 | 1.5 / 37 | 5 |
| Oct | 59 / 15 | 34 / 1 | 1.0 / 25 | 5 |
| Nov | 47 / 9 | 24 / -4 | 0.6 / 15 | 4 |
| Dec | 39 / 4 | 18 / -8 | 0.5 / 12 | 3 |
Extremes since 1915: highest 100°F / 38°C (July 11, 1939), lowest -34°F / -37°C (February 8, 1936).
Daylight lasts about 15.0 hours in June and 9.0 hours in December.
Data: Meteostat — Cheyenne Airport, 1991–2020 averages.
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