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.

July is the hottest month for Cheyenne with an average high temperature of 84.2°, which ranks it as cooler than most places in Wyoming. In Cheyenne, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Cheyenne are June, August and September.

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

December has the coldest nighttime temperatures for Cheyenne with an average of 15.8°. This is one of the warmest places in Wyoming.

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

In Cheyenne, there are 14.0 days annually when the high temperature is over 90°, which is about average compared to other 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 Cheyenne, there are 173.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most 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.

In Cheyenne, there are 8.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Wyoming.

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.


June is the wettest month in Cheyenne with 2.5 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Autumn with 41% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 16.5 inches in Cheyenne means that it is wetter than most 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.

May is the rainiest month in Cheyenne with 11.2 days of rain, and January is the driest month with only 4.2 rainy days. There are 91.9 rainy days annually in Cheyenne, which is rainier than most places in Wyoming. The rainiest season is Autumn when it rains 33% of the time and the driest is Spring with only a 16% chance of a rainy day.

An annual snowfall of 70.3 inches in Casper means that it is snowier than most places in Wyoming.

An annual snowfall of 58.3 inches in Cheyenne 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.

March is the snowiest month in Cheyenne with 11.0 inches of snow, and 9 months of the year have significant snowfall.

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