Boulder, CO has a mild climate with warm summers and cold winters. During the summer months, temperatures can reach up to the 90s Fahrenheit (32-37 °C), while during winter temperatures usually stay between 20-30 °F (-7 to -1 °C). The climate is relatively dry in Boulder with an average of 12 inches of precipitation per year. The city also experiences four distinct seasons which bring a variety of weather conditions such as snowfall in the winter and occasional thunderstorms in the summer. In addition to being one of the sunniest cities in Colorado, Boulder receives a great deal of sunshine year round, making it the perfect place for outdoor activities.
Boulder, Colorado gets 18 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Boulder averages 71 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. The US average is 205 sunny days.
Boulder gets some kind of precipitation, on average, 88 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.
Summer High: the July high is around 88 degrees
Winter Low: the January low is 19
Rain: averages 18 inches of rain a year
Snow: averages 71 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.
8.6 / 5.6
Summer / Winter
September, June and August are the most pleasant months in Boulder, while December and January are the least comfortable months.