Bishop House · Photo: Chevsapher · CC0Casper Mountain gets about 82 inches of snow a winter, more than 95% of U.S. towns
Sunny July days climb to about 76°. By July afternoons alone, it runs cooler than 98% of U.S. towns. Since 1901–2000, the year has warmed by 1.6°, most of all in March. The outdoor season runs from June to September, with highs of 64–76°.
A year in Casper Mountain at a glance
Each month’s typical high and low, and what it brings.
What stands out about Casper Mountain’s climate
Compared with towns across the U.S., with Casper Mountain’s place in Wyoming beside it.
What a year in Casper Mountain feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 82 inches of snow a winter
Snow, measured at Casper 4.3 Wsw, WY, falls mostly in December. Precipitation (rain plus melted snow) adds up to 25 inches a year; April is the wettest month and August the driest. Rain or snow falls on about 99 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Casper Mountain’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 5a.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 26 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Casper Mountain from natural hazards, river flooding is the largest share (43%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Casper Mountain and similar climates
TownRatings has no climate map of the towns around Casper Mountain yet.
Climates most like Casper Mountain’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Casper Mountain, WY | 13° | 76° | 25" | 82" |
| Marquette, MI | 11° | 76° | 32" | 102" |
| Sturgeon Bay, WI | 13° | 77° | 32" | 57" |
| Woodland Park, CO | 11° | 77° | 22" | 134" |
| Duluth, MN | 5° | 76° | 30" | 56" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
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°).
A bigger shift than in 67% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Casper Mountain compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Casper Mountain’s place among Wyoming’s.
Casper Mountain weather by month
Highs, lows and precipitation from NOAA’s grid at Casper Mountain’s center; snow, wet days and snow on the ground from Casper 4.3 Wsw, WY. 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" | 0.0" | 9 | 0 | 48° – 62° |
| July | 76° | 51° | 1.1" | 0.0" | 8 | 0 | 56° – 68° |
| August | 74° | 50° | 0.9" | 0.0" | 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 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 17° to 37°. August is the most reliable, staying within 9°.
Where Casper Mountain’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Casper Mountain’s center.
- Snow: Casper 4.3 Wsw, WY.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Casper Mountain’s climate
What is the weather like in Casper Mountain?
A typical July afternoon reaches 76°, a January night drops to 13°, and about 82 inches of snow falls in a normal winter. Colder January nights than 89% of U.S. towns; cooler July afternoons than 98% of U.S. towns.
How cold does it get in Casper Mountain in winter?
February nights average 13°. In the coldest February of the last 30 years the month averaged 16°.
How much snow does Casper Mountain get?
About 82 inches in a normal winter at Casper 4.3 Wsw, WY, most of it in December, with snow on the ground about 84 days a year.
How hot does it get in Casper Mountain?
July, with a typical high of 76°. 90° days are rare.
What growing zone is Casper Mountain in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −16°.
What is the best time of year to visit Casper Mountain?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Casper Mountain getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 67% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Casper Mountain.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.