| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.4° | -7.7° | 9.5mm | 5.3 | 25 |
| February | 4.4° | -8° | 13.8mm | 6.9 | 21 |
| March | 9.3° | -4.2° | 26.5mm | 7.6 | 41 |
| April | 12.7° | -1° | 44.8mm | 10 | 52 |
| May | 17.8° | 4.3° | 60.3mm | 13 | 67 |
| June | 25.1° | 9.7° | 51.6mm | 10.3 | 79 |
| July | 29.3° | 13.5° | 52.9mm | 10.2 | 70 |
| August | 28.1° | 12.4° | 39.2mm | 9.9 | 76 |
| September | 23.4° | 7.8° | 34.6mm | 6.8 | 86 |
| October | 15.4° | 1.1° | 23.4mm | 6.4 | 71 |
| November | 9.2° | -4° | 14mm | 5.3 | 46 |
| December | 4.3° | -7.7° | 11.9mm | 5.8 | 24 |
January in Cheyenne averages a daily high of 4.4°C with nights around -7.7°C. Expect roughly 5.3 wet days totalling 9.5mm. A hard month to visit for comfort alone.
February in Cheyenne averages a daily high of 4.4°C with nights around -8°C. Expect roughly 6.9 wet days totalling 13.8mm. A hard month to visit for comfort alone.
March in Cheyenne averages a daily high of 9.3°C with nights around -4.2°C. Expect roughly 7.6 wet days totalling 26.5mm. Demanding conditions — pack for it and plan indoor options.
April in Cheyenne averages a daily high of 12.7°C with nights around -1°C. Expect roughly 10 wet days totalling 44.8mm. Demanding conditions — pack for it and plan indoor options.
May in Cheyenne averages a daily high of 17.8°C with nights around 4.3°C. Expect roughly 13 wet days totalling 60.3mm. Generally workable, with some weather to plan around.
June in Cheyenne averages a daily high of 25.1°C with nights around 9.7°C. Expect roughly 10.3 wet days totalling 51.6mm. Comfortable conditions for being outdoors all day.
July in Cheyenne averages a daily high of 29.3°C with nights around 13.5°C. Expect roughly 10.2 wet days totalling 52.9mm. Generally workable, with some weather to plan around.
August in Cheyenne averages a daily high of 28.1°C with nights around 12.4°C. Expect roughly 9.9 wet days totalling 39.2mm. Comfortable conditions for being outdoors all day.
September in Cheyenne averages a daily high of 23.4°C with nights around 7.8°C. Expect roughly 6.8 wet days totalling 34.6mm. Comfortable conditions for being outdoors all day.
October in Cheyenne averages a daily high of 15.4°C with nights around 1.1°C. Expect roughly 6.4 wet days totalling 23.4mm. Generally workable, with some weather to plan around.
November in Cheyenne averages a daily high of 9.2°C with nights around -4°C. Expect roughly 5.3 wet days totalling 14mm. Demanding conditions — pack for it and plan indoor options.
December in Cheyenne averages a daily high of 4.3°C with nights around -7.7°C. Expect roughly 5.8 wet days totalling 11.9mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Cheyenne peaks at 86.
Based on 30 years of records, June scores highest for comfort in Cheyenne, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.3°C.
May is the wettest, averaging 60.3mm of rain across roughly 13 wet days.
December is the coolest month, with average daily highs around 4.3°C.