2025 Compare Climate & Weather:
Castle Rock, CO vs Coppell, TX

Highlights

On average, there are 229 sunny days per year in Coppell. Castle Rock averages 243 sunny days per year. The US average is 205 sunny days.

Coppell, Texas gets 37.6 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.

Coppell averages 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

Coppell, Texas
Summer High: the July high is around 95.3 degrees
Winter Low: the January low is 35.4
Rain: averages 37.6 inches of rain a year
Snow: averages 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 Coppell is 7.0 (10=best), which means it is about average compared to other places in Texas.

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

44°F

Today's Weather - Coppell, TX

60°F

Average Monthly High / Low (°F)

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

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.

August is the hottest month for Coppell with an average high temperature of 95.9°, which ranks it as warmer than most places in Texas. In Coppell, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Coppell are October, April and May.

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 Coppell with an average of 35.4°. This is about average compared to other places in Texas.

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 Coppell, there are 92.2 days annually when the high temperature is over 90°, which is about average compared to other places in Texas.

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 Coppell, there are 29.7 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Texas.

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

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 Coppell with 5.1 inches of rain, and the driest month is August with 1.8 inches. The wettest season is Summer with 32% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 37.6 inches in Coppell means that it is about average compared to other places in Texas.

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 Coppell with 8.6 days of rain, and July is the driest month with only 4.5 rainy days. There are 77.3 rainy days annually in Coppell, which is rainier than most places in Texas. The rainiest season is Summer when it rains 29% of the time and the driest is Autumn with only a 22% 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 1.0 inches in Coppell means that it is snowier than most places in Texas.

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

February is the snowiest month in Coppell with 0.4 inches of snow, and no months of the year have significant snowfall.