2025 Compare Climate & Weather:
Castle Pines, CO vs Boulder, CO

Highlights

On average, there are 245 sunny days per year in Boulder. Castle Pines averages 245 sunny days per year. The US average is 205 sunny days.

Boulder, Colorado gets 18.1 inches of rain, on average, per year. Castle Pines, Colorado gets 18.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Boulder averages 71.1 inches of snow per year. Castle Pines averages 75.5 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Boulder, Colorado
Summer High: the July high is around 88.1 degrees
Winter Low: the January low is 18.9
Rain: averages 18.1 inches of rain a year
Snow: averages 71.1 inches of snow a year

Castle Pines, Colorado
Summer High: the July high is around 85.4 degrees
Winter Low: the January low is 18.5
Rain: averages 18.1 inches of rain a year
Snow: averages 75.5 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Boulder is 7.1 (10=best), which means it is about average compared to other places in Colorado.

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

Today's Weather - Castle Pines, CO

58°F

Today's Weather - Boulder, CO

63°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Castle Pines / Boulder

July is the hottest month for Castle Pines with an average high temperature of 85.4°, which ranks it as about average compared to other places in Colorado. In Castle Pines, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Castle Pines are June, September and August.

July is the hottest month for Boulder with an average high temperature of 88.1°, which ranks it as about average compared to other places in Colorado. In Boulder, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boulder are September, June and May.

December has the coldest nighttime temperatures for Castle Pines with an average of 18.2°. This is one of the warmest places in Colorado.

December has the coldest nighttime temperatures for Boulder with an average of 18.3°. This is one of the warmest places in Colorado.

In Castle Pines, there are 14.8 days annually when the high temperature is over 90°, which is cooler than most places in Colorado.

In Boulder, there are 32.4 days annually when the high temperature is over 90°, which is about average compared to other places in Colorado.

In Castle Pines, there are 156.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

In Boulder, there are 151.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

In Castle Pines, there are 5.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

In Boulder, there are 5.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

July is the wettest month in Castle Pines with 2.8 inches of rain, and the driest month is February with 0.5 inches. The wettest season is Autumn with 43% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 18.1 inches in Castle Pines means that it is wetter than most places in Colorado.


May is the wettest month in Boulder with 2.5 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Summer with 37% of yearly precipitation and 11% occurs in Spring, which is the driest season. The annual rainfall of 18.1 inches in Boulder means that it is wetter than most places in Colorado.

August is the rainiest month in Castle Pines with 10.2 days of rain, and January is the driest month with only 3.4 rainy days. There are 72.6 rainy days annually in Castle Pines, 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 Boulder with 10.5 days of rain, and January is the driest month with only 4.7 rainy days. There are 88.0 rainy days annually in Boulder, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.

An annual snowfall of 75.5 inches in Castle Pines means that it is snowier than most places in Colorado.

An annual snowfall of 71.1 inches in Boulder means that it is snowier than most places in Colorado.

March is the snowiest month in Castle Pines with 16.3 inches of snow, and 9 months of the year have significant snowfall.

March is the snowiest month in Boulder with 14.3 inches of snow, and 9 months of the year have significant snowfall.