Casper, Wyoming 

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Climate in Casper, Wyoming

Casper has a semi-arid climate with cold winters and hot summers. The area experiences low humidity levels throughout most of the year and receives a moderate amount of precipitation mostly during the summer months.

Casper, Wyoming gets 13 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Casper averages 70 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 220 sunny days per year in Casper. The US average is 205 sunny days.

Casper gets some kind of precipitation, on average, 79 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 88 degrees
Winter Low: the January low is 15
Rain: averages 13 inches of rain a year
Snow: averages 70 inches of snow a year


The annual BestPlaces Comfort Index for Casper is 6.8 (10=best), which means it is more comfortable than most places in Wyoming.

8.8 / 4.9

Summer   /   Winter
June, August and September are the most pleasant months in Casper, while December and February are the least comfortable months.

Climate Averages
  Casper, WyomingUnited States
  13.0 in.38.1 in.
  70.3 in.27.8 in.
  79.2 days106.2 days
  220 days205 days
  5105 ft.2443 ft.


Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Casper with an average high temperature of 88.2°, which ranks it as warmer than most places in Wyoming. In Casper, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Casper are June, September and August.

In Casper, there are 29.7 days annually when the high temperature is over 90°, which is hotter than most places in Wyoming.

January has the coldest nighttime temperatures for Casper with an average of 15.4°. This is one of the warmest places in Wyoming.

In Casper, there are 168.3 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Wyoming.

In Casper, there are 12.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Wyoming.

Humidity is low in Casper, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

May is the wettest month in Casper with 2.2 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Summer with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 13.0 inches in Casper means that it is about average compared to other places in Wyoming.

May is the rainiest month in Casper with 10.0 days of rain, and January is the driest month with only 5.0 rainy days. There are 79.2 rainy days annually in Casper, which is rainier than most places in Wyoming. The rainiest season is Summer when it rains 32% of the time and the driest is Spring with only a 20% chance of a rainy day.

An annual snowfall of 70.3 inches in Casper means that it is snowier than most places in Wyoming. March is the snowiest month in Casper with 11.5 inches of snow, and 9 months of the year have significant snowfall.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Casper    36 Reviews
    Where wander meets wonder - 11/3/2021
    Wyoming is an interesting place. From vast mountains that pulls you towards them to flat plains as far as the eye can see. The people are same as every where else other... Read More

    Start Your Review of Casper

    Just don't - 9/19/2021
    I've lived here 3 mo..... this place is run my retired Republicans that have nothing better to do then mess up other people's day. The town is very poorly taken care... Read More

    Ehhh - 12/26/2020
    I lived here for one year (78-79). Saw a lot of cold weather and snow. Most cars had sprung doors from severe winds taking them out of their owners hands. Might have... Read More

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