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Casper, Wyoming climate
Cfa Humid subtropical
Casper has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 88°F, while the coldest is January averaging around 17°F at night. Precipitation totals about 13 inches a year and is strongly seasonal — May alone averages 2.7 inches while January barely receives 0.44 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 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 countsCasper climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 38 | 40 | 49 | 57 | 67 | 79 | 88 | 87 | 76 | 61 | 48 | 38 |
| Avg temp (°F) | 27 | 29 | 37 | 44 | 54 | 64 | 72 | 71 | 60 | 47 | 36 | 28 |
| Avg low (°F) | 17 | 18 | 25 | 31 | 41 | 50 | 56 | 55 | 44 | 33 | 25 | 17 |
| Precipitation (in) | 0.4 | 0.6 | 1.0 | 1.5 | 2.7 | 1.6 | 1.2 | 1.0 | 1.1 | 1.3 | 0.5 | 0.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 38 | 40 | 49 | 57 | 67 | 79 |
| Avg temp (°F) | 27 | 29 | 37 | 44 | 54 | 64 |
| Avg low (°F) | 17 | 18 | 25 | 31 | 41 | 50 |
| Precipitation (in) | 0.4 | 0.6 | 1.0 | 1.5 | 2.7 | 1.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 87 | 76 | 61 | 48 | 38 |
| Avg temp (°F) | 72 | 71 | 60 | 47 | 36 | 28 |
| Avg low (°F) | 56 | 55 | 44 | 33 | 25 | 17 |
| Precipitation (in) | 1.2 | 1.0 | 1.1 | 1.3 | 0.5 | 0.7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 5 | 5 | 7 | 9 | 7 | 6 | 6 | 6 | 5 | 4 | 5 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.3 | 5 | 16 | 11 | 2 | — | — | — |
| Days with low ≤ 32°F (days) | 27 | 25 | 24 | 17 | 4 | 0.1 | — | — | 1 | 11 | 21 | 25 |
| Days with snowfall ≥ 1 in (days) | 2 | 3 | 2 | 2 | 0.4 | — | — | — | 0.1 | 1 | 1 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 5 | 5 | 7 | 9 | 7 |
| Days with high ≥ 90°F (days) | — | — | — | — | 0.3 | 5 |
| Days with low ≤ 32°F (days) | 27 | 25 | 24 | 17 | 4 | 0.1 |
| Days with snowfall ≥ 1 in (days) | 2 | 3 | 2 | 2 | 0.4 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 6 | 6 | 6 | 5 | 4 | 5 |
| Days with high ≥ 90°F (days) | 16 | 11 | 2 | — | — | — |
| Days with low ≤ 32°F (days) | — | — | 1 | 11 | 21 | 25 |
| Days with snowfall ≥ 1 in (days) | — | — | 0.1 | 1 | 1 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 65 | 65 | 66 | 63 | 48 | 44 | 45 | 44 | 54 | 60 | 63 |
| Clear days (≤ 30% cloud) | 4 | 3 | 4 | 4 | 4 | 9 | 11 | 10 | 12 | 9 | 5 | 4 |
| Partly cloudy days (30–70%) | 14 | 12 | 12 | 10 | 12 | 13 | 14 | 14 | 11 | 10 | 12 | 13 |
| Cloudy days (≥ 70%) | 13 | 13 | 15 | 16 | 15 | 8 | 6 | 7 | 8 | 12 | 13 | 14 |
| Relative humidity (%) | 71 | 66 | 59 | 57 | 55 | 47 | 41 | 40 | 43 | 54 | 61 | 70 |
| Wind speed (mph) | 11.0 | 10.0 | 8.9 | 8.1 | 7.1 | 6.8 | 6.1 | 6.3 | 7.0 | 8.1 | 9.4 | 10.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 65 | 65 | 66 | 63 | 48 |
| Clear days (≤ 30% cloud) | 4 | 3 | 4 | 4 | 4 | 9 |
| Partly cloudy days (30–70%) | 14 | 12 | 12 | 10 | 12 | 13 |
| Cloudy days (≥ 70%) | 13 | 13 | 15 | 16 | 15 | 8 |
| Relative humidity (%) | 71 | 66 | 59 | 57 | 55 | 47 |
| Wind speed (mph) | 11.0 | 10.0 | 8.9 | 8.1 | 7.1 | 6.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 44 | 45 | 44 | 54 | 60 | 63 |
| Clear days (≤ 30% cloud) | 11 | 10 | 12 | 9 | 5 | 4 |
| Partly cloudy days (30–70%) | 14 | 14 | 11 | 10 | 12 | 13 |
| Cloudy days (≥ 70%) | 6 | 7 | 8 | 12 | 13 | 14 |
| Relative humidity (%) | 41 | 40 | 43 | 54 | 61 | 70 |
| Wind speed (mph) | 6.1 | 6.3 | 7.0 | 8.1 | 9.4 | 10.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Casper Wwtp (NOAA GHCN station USC00481569), 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.