2025 Compare Climate & Weather:
Gillette, WY vs Casa Grande, AZ

Highlights

On average, there are 295 sunny days per year in Casa Grande. Gillette averages 209 sunny days per year. The US average is 205 sunny days.

Casa Grande, Arizona gets 8.9 inches of rain, on average, per year. Gillette, Wyoming gets 15.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Casa Grande averages 0 inches of snow per year. Gillette averages 52.6 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Casa Grande, Arizona
Summer High: the July high is around 106.8 degrees
Winter Low: the January low is 36.9
Rain: averages 8.9 inches of rain a year
Snow: averages 0 inches of snow a year

Gillette, Wyoming
Summer High: the July high is around 86.8 degrees
Winter Low: the January low is 12.9
Rain: averages 15.4 inches of rain a year
Snow: averages 52.6 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Casa Grande is 7.2 (10=best), which means it is less comfortable than most places in Arizona.

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

Today's Weather - Gillette, WY

44°F

Today's Weather - Casa Grande, AZ

55°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Gillette / Casa Grande

July is the hottest month for Gillette with an average high temperature of 86.8°, which ranks it as warmer than most places in Wyoming. In Gillette, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Gillette are June, September and August.

July is the hottest month for Casa Grande with an average high temperature of 106.8°, which ranks it as warmer than most places in Arizona. In Casa Grande, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Casa Grande are March, November and February.

December has the coldest nighttime temperatures for Gillette with an average of 12.1°. This is warmer than most places in Wyoming.

December has the coldest nighttime temperatures for Casa Grande with an average of 36.2°. This is warmer than most places in Arizona.

In Gillette, there are 28.1 days annually when the high temperature is over 90°, which is hotter than most places in Wyoming.

In Casa Grande, there are 178.2 days annually when the high temperature is over 90°, which is one of the hottest places in Arizona.

In Gillette, there are 178.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wyoming.

In Casa Grande, there are 22.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Arizona.

In Gillette, there are 16.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Wyoming.

In Casa Grande, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Arizona.

May is the wettest month in Gillette with 2.8 inches of rain, and the driest month is January with 0.4 inches. The wettest season is Summer with 36% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 15.4 inches in Gillette means that it is wetter than most places in Wyoming.


August is the wettest month in Casa Grande with 1.5 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 33% of yearly precipitation and 17% occurs in Summer, which is the driest season. The annual rainfall of 8.9 inches in Casa Grande means that it is drier than most places in Arizona.

May is the rainiest month in Gillette with 9.8 days of rain, and January is the driest month with only 5.1 rainy days. There are 80.3 rainy days annually in Gillette, which is rainier than most places in Wyoming. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 20% chance of a rainy day.

August is the rainiest month in Casa Grande with 4.6 days of rain, and June is the driest month with only 0.5 rainy days. There are 31.8 rainy days annually in Casa Grande, which is less rainy than most places in Arizona. The rainiest season is Spring when it rains 33% of the time and the driest is Summer with only a 19% chance of a rainy day.

An annual snowfall of 52.6 inches in Gillette means that it is about average compared to other places in Wyoming.

There is rarely any recorded snowfall in Casa Grande, ranking it as one of the least snowy places in Arizona.

March is the snowiest month in Gillette with 10.0 inches of snow, and 9 months of the year have significant snowfall.

Any measurable snowfall is a rare occurance in Casa Grande.