Casper, WY Weather & Climate Normals
Casper's real weather, in one number
Casper, WY scores 44/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Casper's hottest and coldest months
Casper's hottest month is Jul, averaging 72°F; its coldest is Jan, averaging 27°F, a 45°F swing across the year, a middling gap by national standards.
Casper's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 38°F | 17°F | 0.44in |
| Feb | 40°F | 18°F | 0.63in |
| Mar | 49°F | 25°F | 0.97in |
| Apr | 57°F | 31°F | 1.47in |
| May | 67°F | 41°F | 2.74in |
| Jun | 79°F | 50°F | 1.55in |
| Jul | 88°F | 56°F | 1.21in |
| Aug | 87°F | 55°F | 1.02in |
| Sep | 76°F | 44°F | 1.05in |
| Oct | 61°F | 33°F | 1.25in |
| Nov | 48°F | 25°F | 0.45in |
| Dec | 38°F | 17°F | 0.65in |
Jun, Jul, Aug, and Sep are the best time to see Casper at its mildest; the rest of the year, plan around Jan's cold.
Rain and snow in Casper
Over a typical year, Casper sees about 13.43in of precipitation a year across roughly 72 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Casper ranks
Casper ranks 3687 of 4876 US cities in this dataset for comfort score, and 2 of 16 within WY. About 58,823 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Casper Wwtp, WY US, 2.0 miles from Casper, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is