Jefferson, CO County has a typical high-altitude climate with cold winters and mild summers. Winter temperatures typically range between 18-30°F while summer temperatures average between 50-70°F. The county experiences its highest amounts of precipitation throughout the spring and late summer months with around 14 inches annually. Jefferson, CO County enjoys around 300 days of sunshine per year, making it an ideal place to enjoy outdoor activities year round.
Jefferson County, Colorado gets 18 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Jefferson County averages 72 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 Jefferson County. The US average is 205 sunny days.
Jefferson County gets some kind of precipitation, on average, 83 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 86 degrees
Winter Low: the January low is 17
Rain: averages 18 inches of rain a year
Snow: averages 72 inches of snow a year