2025 Compare Climate & Weather:
Castle Rock, CO vs Evanston, WY

Highlights

On average, there are 227 sunny days per year in Evanston. Castle Rock averages 243 sunny days per year. The US average is 205 sunny days.

Evanston, Wyoming gets 13.2 inches of rain, on average, per year. Castle Rock, Colorado gets 18.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Evanston averages 63.1 inches of snow per year. Castle Rock averages 78.3 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Evanston, Wyoming
Summer High: the July high is around 79.8 degrees
Winter Low: the January low is 9.1
Rain: averages 13.2 inches of rain a year
Snow: averages 63.1 inches of snow a year

Castle Rock, Colorado
Summer High: the July high is around 85.5 degrees
Winter Low: the January low is 18.6
Rain: averages 18.6 inches of rain a year
Snow: averages 78.3 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Evanston is 6.3 (10=best), which means it is less comfortable than most places in Wyoming.

The annual BestPlaces Comfort Index for Castle Rock is 7.2 (10=best), which means it is more comfortable than most places in Colorado.

Today's Weather - Castle Rock, CO

68°F

Today's Weather - Evanston, WY

69°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Castle Rock / Evanston

July is the hottest month for Castle Rock with an average high temperature of 85.5°, which ranks it as about average compared to other places in Colorado. In Castle Rock, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Castle Rock are June, September and August.

July is the hottest month for Evanston with an average high temperature of 79.8°, which ranks it as one of the coolest places in Wyoming. In Evanston, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Evanston are August, July and June.

December has the coldest nighttime temperatures for Castle Rock with an average of 18.1°. This is one of the warmest places in Colorado.

December has the coldest nighttime temperatures for Evanston with an average of 8.7°. This is about average compared to other places in Wyoming.

In Castle Rock, there are 14.9 days annually when the high temperature is over 90°, which is cooler than most places in Colorado.

In Evanston, there are 1.3 days annually when the high temperature is over 90°, which is one of the coolest places in Wyoming.

In Castle Rock, there are 156.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

In Evanston, there are 224.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Wyoming.

In Castle Rock, there are 5.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

In Evanston, there are 22.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

August is the wettest month in Castle Rock with 2.6 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Autumn with 40% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 18.6 inches in Castle Rock means that it is wetter than most places in Colorado.


May is the wettest month in Evanston with 1.6 inches of rain, and the driest month is February with 0.7 inches. The wettest season is Summer with 30% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 13.2 inches in Evanston means that it is about average compared to other places in Wyoming.

August is the rainiest month in Castle Rock with 9.9 days of rain, and January is the driest month with only 3.3 rainy days. There are 70.0 rainy days annually in Castle Rock, which is less rainy than most places in Colorado. The rainiest season is Autumn when it rains 37% of the time and the driest is Spring with only a 15% chance of a rainy day.

May is the rainiest month in Evanston with 7.9 days of rain, and July is the driest month with only 5.5 rainy days. There are 78.1 rainy days annually in Evanston, which is rainier than most places in Wyoming. The rainiest season is Summer when it rains 28% of the time and the driest is Autumn with only a 23% chance of a rainy day.

An annual snowfall of 78.3 inches in Castle Rock means that it is snowier than most places in Colorado.

An annual snowfall of 63.1 inches in Evanston means that it is snowier than most places in Wyoming.

March is the snowiest month in Castle Rock with 16.8 inches of snow, and 9 months of the year have significant snowfall.

January is the snowiest month in Evanston with 13.3 inches of snow, and 9 months of the year have significant snowfall.