2025 Compare Climate & Weather:
Chester, CA vs Thermopolis, WY

Highlights

On average, there are 235 sunny days per year in Thermopolis. Chester averages 243 sunny days per year. The US average is 205 sunny days.

Thermopolis, Wyoming gets 11.1 inches of rain, on average, per year. Chester, California gets 40.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Thermopolis averages 21.8 inches of snow per year. Chester averages 121.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Thermopolis, Wyoming
Summer High: the July high is around 90.4 degrees
Winter Low: the January low is 6.5
Rain: averages 11.1 inches of rain a year
Snow: averages 21.8 inches of snow a year

Chester, California
Summer High: the July high is around 83.9 degrees
Winter Low: the January low is 22.3
Rain: averages 40.7 inches of rain a year
Snow: averages 121.4 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Thermopolis is 7.0 (10=best), which means it is one of the most pleasant places in Wyoming.

The annual BestPlaces Comfort Index for Chester is 6.7 (10=best), which means it is one of the least comfortable places in California.

Today's Weather - Chester, CA

51°F

Today's Weather - Thermopolis, WY

66°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Chester / Thermopolis

July is the hottest month for Chester with an average high temperature of 83.9°, which ranks it as cooler than most places in California. In Chester, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chester are September, June and August.

July is the hottest month for Thermopolis with an average high temperature of 90.4°, which ranks it as one of the hottest places in Wyoming. In Thermopolis, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Thermopolis are September, June and May.

January has the coldest nighttime temperatures for Chester with an average of 22.3°. This is one of the coldest places in California.

January has the coldest nighttime temperatures for Thermopolis with an average of 6.5°. This is colder than most places in Wyoming.

In Chester, there are 11.9 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Thermopolis, there are 41.4 days annually when the high temperature is over 90°, which is one of the hottest places in Wyoming.

In Chester, there are 176.7 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in California.

In Thermopolis, there are 181.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Wyoming.

In Chester, there are 0.8 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in California.

In Thermopolis, there are 23.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

December is the wettest month in Chester with 7.3 inches of rain, and the driest month is July with 0.2 inches. The wettest season is Spring with 50% of yearly precipitation and 3% occurs in Autumn, which is the driest season. The annual rainfall of 40.7 inches in Chester means that it is wetter than most places in California.


May is the wettest month in Thermopolis with 1.8 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Summer with 37% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 11.1 inches in Thermopolis means that it is drier than most places in Wyoming.

December is the rainiest month in Chester with 11.5 days of rain, and July is the driest month with only 1.0 rainy days. There are 83.2 rainy days annually in Chester, which is one of the rainiest places in California. The rainiest season is Spring when it rains 40% of the time and the driest is Autumn with only a 7% chance of a rainy day.

May is the rainiest month in Thermopolis with 8.1 days of rain, and January is the driest month with only 3.2 rainy days. There are 60.8 rainy days annually in Thermopolis, which is less rainy 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 16% chance of a rainy day.

An annual snowfall of 121.4 inches in Chester means that it is one of the snowiest places in California.

An annual snowfall of 21.8 inches in Thermopolis means that it is one of the least snowy places in Wyoming.

January is the snowiest month in Chester with 31.1 inches of snow, and 8 months of the year have significant snowfall.

January is the snowiest month in Thermopolis with 4.1 inches of snow, and 7 months of the year have significant snowfall.