Casper (WY) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Casper.
Climate overview of Casper
The climate in Casper, Wyoming, United States of America, is marked by large temperature swings across the seasons, ranging from 31°C (88°F) in July to 2°C (36°F) in December.
The city has a relatively dry climate, receiving around 360 mm (14 in) of rain/snowfall per year. It does experience a distinct dry season from June to March. May is the wettest month and November the driest.
Casper Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Casper — and find the best time to visit.
Monthly Temperature in Casper
In Casper, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a very warm 31°C (88°F) in July to a very cold 2°C (36°F) in December.
Nighttime temperatures range from 13°C (55°F) in July to -9°C (16°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Casper
Casper typically sees modest rain/snowfall throughout the year, with an average annual precipitation of 360 mm (14 in). The seasons in Casper bring significant changes in precipitation. The wettest month, May, receives moderate rainfall, with an average of 74 mm (2.9 in) of precipitation. This rainfall is distributed across 13 rainy days.
In contrast, the driest month, November, experiences much less snow/rainfall, totaling 11 mm (0.4 in) over 5 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Casper Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Casper
Frequently asked questions about the climate in Casper
What is the best time to visit Casper?
June and September typically offer the most optimal weather in Casper. In contrast, January, February, March and December tend to have less optimal conditions. Casper has a distinct dry season from June to March.
What temperatures can I expect in Casper?
Daytime highs range from 2°C (36°F) in December to 31°C (88°F) in July. Nighttime lows range from -9°C (16°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does Casper get?
Annual rainfall is around 360 mm (14 in). May is the wettest month with 74 mm (2.9 in), while November is the driest with 11 mm (0.4 in).
Casper 3-Day Forecast
Casper (WY) 3-Day Forecast
Casper on the map
Casper is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.