Boulder County, CO Climate

The climate in Boulder, CO County is generally mild and sunny. Summers are warm with an average high of 85°F and an average low of 57°F. Winters are cold but not as severe as other areas of Colorado, with an average high of 46°F and an average low of 20°F. There is a dry, continental climate here with very little humidity throughout the year. Precipitation is relatively light at around 19 inches annually, and there are about 250 days of sunshine each year. All in all, Boulder enjoys pleasant weather conditions year-round that can be enjoyed by locals and visitors alike!

Boulder County, Colorado gets 18 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Boulder County averages 82 inches of snow per year. The US average is 28 inches of snow per year.

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

Boulder County gets some kind of precipitation, on average, 94 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 85 degrees
Winter Low: the January low is 16
Rain: averages 18 inches of rain a year
Snow: averages 82 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Boulder County is 6.8 (10=best), which means it is less comfortable than most places in Colorado.

8.5 Summer - 5.1 Winter

August, June and September are the most pleasant months in Boulder County, while December and January are the least comfortable months.

Climate	Boulder, Colorado	United States
	Unlock	38.1 in.
	81.8 in.	Unlock
	Unlock	106.2 days
	245 days	Unlock
	85.4°	85.8°
	Unlock	21.7°
	6.8	Unlock
	Unlock	4.3
	7389 ft.	Unlock

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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

In Boulder County, there are 26.5 days annually when the high temperature is over 90°, which is about average compared to other places in Colorado.

December has the coldest nighttime temperatures for Boulder County with an average of 15.4°. This is warmer than most places in Colorado.

In Boulder County, there are 174.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Colorado.

In Boulder County, there are 10.8 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Colorado.

Humidity is low in Boulder County, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

May is the wettest month in Boulder County with 2.3 inches of rain, and the driest month is January with 0.7 inches. The wettest season is Summer with 35% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 17.8 inches in Boulder County means that it is wetter than most places in Colorado.

May is the rainiest month in Boulder County with 10.3 days of rain, and January is the driest month with only 6.0 rainy days. There are 93.8 rainy days annually in Boulder County, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 30% of the time and the driest is Spring with only a 19% chance of a rainy day.

An annual snowfall of 81.8 inches in Boulder County means that it is snowier than most places in Colorado. March is the snowiest month in Boulder County with 15.7 inches of snow, and 9 months of the year have significant snowfall.

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