Casper Mountain, WY climate
Casper Mountain has cold, snowy winters and cool summers. A typical July afternoon reaches 76°, a January night drops to 13°, and about 82 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Casper Mountain feels like
Winter
Spring
Summer
Fall
Casper Mountain weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 27° | 13° | 1.8" | 11.1" | 7 | 22 | 15° – 26° |
| February | 30° | 13° | 1.9" | 14.6" | 8 | 17 | 16° – 28° |
| March | 39° | 20° | 2.5" | 12.3" | 8 | 9 | 22° – 36° |
| April | 45° | 26° | 3.7" | 10.7" | 12 | 5 | 30° – 41° |
| May | 55° | 35° | 3.7" | 3.0" | 13 | 1 | 39° – 51° |
| June | 67° | 44° | 1.7" | 0 | 9 | 0 | 48° – 62° |
| July | 76° | 51° | 1.1" | 0 | 8 | 0 | 56° – 68° |
| August | 74° | 50° | 0.9" | 0 | 6 | 0 | 57° – 66° |
| September | 64° | 42° | 1.6" | 0.4" | 6 | 0 | 47° – 58° |
| October | 49° | 31° | 2.5" | 5.9" | 8 | 3 | 31° – 47° |
| November | 36° | 20° | 1.8" | 6.7" | 6 | 7 | 17° – 37° |
| December | 27° | 13° | 2.0" | 17.0" | 8 | 20 | 13° – 24° |
| Year | 49° | 30° | 25.3" | 81.7" | 99 | 84 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Casper Mountain
Casper Mountain gets 25 inches of rain and melted snow a year. April is the wettest month and August the driest. Rain or snow falls on about 99 days a year. Snow covers the ground about 84 days of the year.
How Casper Mountain compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Casper Mountain averaged 1.6° warmer than the 1900s. The biggest change is in March (+4.0°). The shift is larger than in 77% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Casper Mountain’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 17° to 37°. August is the most reliable, staying within 9°.
Common questions about Casper Mountain’s climate
What is the coldest month in Casper Mountain?
February, with a typical high of 30° and a low of 13°.
What is the hottest month in Casper Mountain?
July, with a typical high of 76° and a low of 51°.
How much snow does Casper Mountain get?
About 82 inches in a normal winter, most of it in December.
What is the rainiest month in Casper Mountain?
April, with 3.7 inches of rain and melted snow. The year totals 25 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Casper Mountain itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Casper 4.3 Wsw, WY (7 mi, snow). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.