Boulder Metro Area, CO Climate

The Boulder, CO Metro Area has a semi-arid climate characterized by warm and sunny days with low humidity. The area gets an average of 300 days of sunshine each year, making it one of the most sunny places in the United States. Summers can be quite hot, while winters tend to be mild with occasional snowfall. Average temperatures range from 45°F in January to 75°F in July. The region receives an average annual precipitation of 16 inches, mostly as scattered thunderstorms during the spring and summer months. Winters are very dry with very little snowfall or rain.

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

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

On average, there are 246 sunny days per year in Boulder Metro Area. The US average is 205 sunny days.

Boulder Metro Area 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 the Boulder metro area 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 the Boulder metro area, while December and January are the least comfortable months.

Climate	Boulder, Colorado	United States
	17.8 in.	38.1 in.
	81.8 in.	27.8 in.
	93.8 days	106.2 days
	246 days	205 days
	85.4°	85.8°
	15.7°	21.7°
	6.8	7
	5.8	4.3
	7389 ft.	2443 ft.

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

In the Boulder metro area, 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 the Boulder metro area with an average of 15.4°. This is warmer than most places in Colorado.

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

In the Boulder metro area, 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 the Boulder metro area, 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 the Boulder metro area 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 the Boulder metro area means that it is wetter than most places in Colorado.

May is the rainiest month in the Boulder metro area 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 the Boulder metro area, 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 the Boulder metro area means that it is snowier than most places in Colorado. March is the snowiest month in the Boulder metro area with 15.7 inches of snow, and 9 months of the year have significant snowfall.

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