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

Highlights

On average, there are 243 sunny days per year in Castle Rock. Olathe averages 245 sunny days per year. The US average is 205 sunny days.

Castle Rock, Colorado gets 18.6 inches of rain, on average, per year. Olathe, Colorado gets 10.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Castle Rock averages 78.3 inches of snow per year. Olathe averages 35.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

Olathe, Colorado
Summer High: the July high is around 89.8 degrees
Winter Low: the January low is 14.4
Rain: averages 10.5 inches of rain a year
Snow: averages 35.9 inches of snow a year

BestPlaces Comfort Index

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

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

Today's Weather - Olathe, CO

54°F

Today's Weather - Castle Rock, CO

55°F

Average Monthly High / Low (°F)

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

July is the hottest month for Olathe with an average high temperature of 89.8°, which ranks it as warmer than most places in Colorado. In Olathe, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Olathe are September, May and June.

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.

January has the coldest nighttime temperatures for Olathe with an average of 14.4°. This is about average compared to other places in Colorado.

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

In Olathe, there are 35.1 days annually when the high temperature is over 90°, which is hotter 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 Olathe, there are 156.7 days annually when the nighttime low temperature falls below freezing, which is warmer 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 Olathe, there are 3.0 days annually when the nighttime low temperature falls below zero°, which is one of the warmest 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.

September is the wettest month in Olathe with 1.3 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Winter with 32% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 10.5 inches in Olathe means that it is one of the driest 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.

August is the rainiest month in Olathe with 7.9 days of rain, and June is the driest month with only 4.3 rainy days. There are 73.0 rainy days annually in Olathe, which is less rainy than most places in Colorado. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 21% chance of a rainy day.

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.

An annual snowfall of 35.9 inches in Olathe means that it is less snowy than most places in Colorado.

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

January is the snowiest month in Olathe with 9.3 inches of snow, and 7 months of the year have significant snowfall.

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