2025 Compare Climate & Weather:
Castle Rock, CO vs Aspen, CO

Highlights

On average, there are 246 sunny days per year in Aspen. Castle Rock averages 243 sunny days per year. The US average is 205 sunny days.

Aspen, Colorado gets 19.8 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.

Aspen averages 152.6 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

Aspen, Colorado
Summer High: the July high is around 79.6 degrees
Winter Low: the January low is 6.8
Rain: averages 19.8 inches of rain a year
Snow: averages 152.6 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 Aspen is 5.9 (10=best), which means it is less comfortable than most places in Colorado.

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

78°F

Today's Weather - Aspen, CO

70°F

Average Monthly High / Low (°F)

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

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 Aspen with an average high temperature of 79.6°, which ranks it as cooler than most places in Colorado. In Aspen, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Aspen 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.

January has the coldest nighttime temperatures for Aspen with an average of 6.8°. This is colder than most places in Colorado.

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 Aspen, there are 0.8 days annually when the high temperature is over 90°, which is cooler than most places in Colorado.

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 Aspen, there are 220.2 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Colorado.

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 Aspen, there are 20.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Colorado.

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.


September is the wettest month in Aspen with 1.9 inches of rain, and the driest month is June with 1.2 inches. The wettest season is Summer with 27% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 19.8 inches in Aspen means that it is wetter than most places in Colorado.

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.

August is the rainiest month in Aspen with 12.3 days of rain, and June is the driest month with only 7.6 rainy days. There are 110.7 rainy days annually in Aspen, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 27% of the time and the driest is Winter 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 152.6 inches in Aspen means that it is one of the snowiest places in Colorado.

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

March is the snowiest month in Aspen with 24.4 inches of snow, and 10 months of the year have significant snowfall.