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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 29°C, while the coldest is December averaging around −8°C at night. Precipitation totals about 391 mm a year and is strongly seasonal — May alone averages 62 mm while January barely receives 9 mm. Snowfall is heavy (160 cm 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 (°C) | 4 | 5 | 10 | 13 | 18 | 25 | 29 | 28 | 23 | 15 | 9 | 4 |
| Avg temp (°C) | −2 | −1 | 3 | 6 | 11 | 17 | 21 | 20 | 15 | 8 | 2 | −2 |
| Avg low (°C) | −8 | −8 | −4 | −1 | 5 | 10 | 13 | 12 | 8 | 1 | −4 | −8 |
| Precipitation (mm) | 9 | 13 | 24 | 45 | 62 | 55 | 54 | 39 | 37 | 25 | 15 | 12 |
| Snowfall (cm) | 16 | 23 | 25 | 29 | 9 | — | — | — | 3 | 15 | 19 | 22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 5 | 10 | 13 | 18 | 25 |
| Avg temp (°C) | −2 | −1 | 3 | 6 | 11 | 17 |
| Avg low (°C) | −8 | −8 | −4 | −1 | 5 | 10 |
| Precipitation (mm) | 9 | 13 | 24 | 45 | 62 | 55 |
| Snowfall (cm) | 16 | 23 | 25 | 29 | 9 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 28 | 23 | 15 | 9 | 4 |
| Avg temp (°C) | 21 | 20 | 15 | 8 | 2 | −2 |
| Avg low (°C) | 13 | 12 | 8 | 1 | −4 | −8 |
| Precipitation (mm) | 54 | 39 | 37 | 25 | 15 | 12 |
| Snowfall (cm) | — | — | 3 | 15 | 19 | 22 |
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 ≥ 32°C (days) | — | — | — | — | 0.1 | 2 | 8 | 4 | 0.6 | — | — | — |
| Days with low ≤ 0°C (days) | 29 | 26 | 25 | 18 | 5 | 0.1 | — | — | 1 | 13 | 24 | 29 |
| Days with snowfall ≥ 2.5 cm (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 ≥ 32°C (days) | — | — | — | — | 0.1 | 2 |
| Days with low ≤ 0°C (days) | 29 | 26 | 25 | 18 | 5 | 0.1 |
| Days with snowfall ≥ 2.5 cm (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 ≥ 32°C (days) | 8 | 4 | 0.6 | — | — | — |
| Days with low ≤ 0°C (days) | — | — | 1 | 13 | 24 | 29 |
| Days with snowfall ≥ 2.5 cm (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 (m/s) | 4.7 | 4.3 | 4.0 | 3.8 | 3.1 | 2.8 | 2.5 | 2.4 | 2.7 | 3.3 | 3.8 | 4.3 |
| 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 (m/s) | 4.7 | 4.3 | 4.0 | 3.8 | 3.1 | 2.8 |
| 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 (m/s) | 2.5 | 2.4 | 2.7 | 3.3 | 3.8 | 4.3 |
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.