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Cheyenne, Wyoming climate
Cfb Oceanic / temperate
Cheyenne has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 84°F, while the coldest is December averaging around 18°F at night. Precipitation totals about 15 inches a year and is strongly seasonal — May alone averages 2.4 inches while January barely receives 0.35 inches. Snowfall is heavy (63 inches of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsCheyenne climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 40 | 41 | 49 | 55 | 64 | 77 | 84 | 82 | 73 | 59 | 48 | 39 |
| Avg temp (°F) | 29 | 30 | 37 | 43 | 52 | 63 | 70 | 68 | 60 | 47 | 36 | 29 |
| Avg low (°F) | 18 | 18 | 25 | 31 | 40 | 49 | 56 | 54 | 46 | 34 | 25 | 18 |
| Precipitation (in) | 0.4 | 0.5 | 1.0 | 1.8 | 2.4 | 2.2 | 2.1 | 1.5 | 1.5 | 1.0 | 0.6 | 0.5 |
| Snowfall (in) | 6.3 | 9.0 | 9.7 | 11.3 | 3.4 | — | — | — | 1.0 | 5.9 | 7.5 | 8.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 40 | 41 | 49 | 55 | 64 | 77 |
| Avg temp (°F) | 29 | 30 | 37 | 43 | 52 | 63 |
| Avg low (°F) | 18 | 18 | 25 | 31 | 40 | 49 |
| Precipitation (in) | 0.4 | 0.5 | 1.0 | 1.8 | 2.4 | 2.2 |
| Snowfall (in) | 6.3 | 9.0 | 9.7 | 11.3 | 3.4 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 84 | 82 | 73 | 59 | 48 | 39 |
| Avg temp (°F) | 70 | 68 | 60 | 47 | 36 | 29 |
| Avg low (°F) | 56 | 54 | 46 | 34 | 25 | 18 |
| Precipitation (in) | 2.1 | 1.5 | 1.5 | 1.0 | 0.6 | 0.5 |
| Snowfall (in) | — | — | 1.0 | 5.9 | 7.5 | 8.8 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 7 | 8 | 11 | 13 | 11 | 11 | 10 | 7 | 7 | 6 | 6 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.1 | 2 | 8 | 4 | 0.6 | — | — | — |
| Days with low ≤ 32°F (days) | 29 | 26 | 25 | 18 | 5 | 0.1 | — | — | 1 | 13 | 24 | 29 |
| Days with snowfall ≥ 1 in (days) | 2 | 3 | 3 | 3 | 0.9 | — | 0.0 | — | 0.3 | 2 | 2 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 7 | 8 | 11 | 13 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.1 | 2 |
| Days with low ≤ 32°F (days) | 29 | 26 | 25 | 18 | 5 | 0.1 |
| Days with snowfall ≥ 1 in (days) | 2 | 3 | 3 | 3 | 0.9 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 7 | 7 | 6 | 6 |
| Days with high ≥ 90°F (days) | 8 | 4 | 0.6 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 1 | 13 | 24 | 29 |
| Days with snowfall ≥ 1 in (days) | 0.0 | — | 0.3 | 2 | 2 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 61 | 61 | 63 | 62 | 50 | 49 | 49 | 46 | 51 | 57 | 60 |
| Clear days (≤ 30% cloud) | 5 | 4 | 5 | 4 | 4 | 8 | 8 | 9 | 11 | 9 | 7 | 5 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 12 | 13 | 14 | 15 | 14 | 10 | 11 | 12 | 13 |
| Cloudy days (≥ 70%) | 12 | 12 | 13 | 14 | 14 | 8 | 8 | 8 | 9 | 10 | 12 | 13 |
| Relative humidity (%) | 64 | 62 | 57 | 55 | 54 | 47 | 46 | 48 | 47 | 52 | 58 | 64 |
| Wind speed (mph) | 10.5 | 9.7 | 9.0 | 8.5 | 6.9 | 6.2 | 5.5 | 5.4 | 6.0 | 7.4 | 8.6 | 9.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 59 | 61 | 61 | 63 | 62 | 50 |
| Clear days (≤ 30% cloud) | 5 | 4 | 5 | 4 | 4 | 8 |
| Partly cloudy days (30–70%) | 14 | 12 | 13 | 12 | 13 | 14 |
| Cloudy days (≥ 70%) | 12 | 12 | 13 | 14 | 14 | 8 |
| Relative humidity (%) | 64 | 62 | 57 | 55 | 54 | 47 |
| Wind speed (mph) | 10.5 | 9.7 | 9.0 | 8.5 | 6.9 | 6.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 49 | 46 | 51 | 57 | 60 |
| Clear days (≤ 30% cloud) | 8 | 9 | 11 | 9 | 7 | 5 |
| Partly cloudy days (30–70%) | 15 | 14 | 10 | 11 | 12 | 13 |
| Cloudy days (≥ 70%) | 8 | 8 | 9 | 10 | 12 | 13 |
| Relative humidity (%) | 46 | 48 | 47 | 52 | 58 | 64 |
| Wind speed (mph) | 5.5 | 5.4 | 6.0 | 7.4 | 8.6 | 9.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Cheyenne (NOAA GHCN station USW00024018), about 2 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.