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

Highlights

On average, there are 242 sunny days per year in Parker. Castle Rock averages 243 sunny days per year. The US average is 205 sunny days.

Parker, Colorado gets 18 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.

Parker averages 76.8 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

Parker, Colorado
Summer High: the July high is around 86.8 degrees
Winter Low: the January low is 17.2
Rain: averages 18 inches of rain a year
Snow: averages 76.8 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 Parker is 7.3 (10=best), which means it is more 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

54°F

Today's Weather - Parker, CO

57°F

Average Monthly High / Low (°F)

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

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 Parker with an average high temperature of 86.8°, which ranks it as about average compared to other places in Colorado. In Parker, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Parker are September, June and August.

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 Parker with an average of 16.5°. This is warmer 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 Parker, there are 20.7 days annually when the high temperature is over 90°, which is about average compared to other 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 Parker, there are 161.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other 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 Parker, there are 6.8 days annually when the nighttime low temperature falls below zero°, which is about average compared to other 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 wettest month in Parker with 2.4 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Autumn with 38% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 18.0 inches in Parker 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 Parker with 8.4 days of rain, and January is the driest month with only 2.7 rainy days. There are 61.6 rainy days annually in Parker, which is one of the least rainy places in Colorado. The rainiest season is Autumn when it rains 36% of the time and the driest is Spring with only a 14% 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 76.8 inches in Parker means that it is snowier than most 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 Parker with 16.4 inches of snow, and 9 months of the year have significant snowfall.