A cloud with its base at the earth's surface. Frontal fog Fog produced when sufficient water vapor is added to the air by evaporation, and the moist air mixes with relatively drier air.
On average, there are 246 sunny days per year in Arvada, Colorado. The July high is around 88 degrees. The January low is 19. Sperling's comfort index for Arvada is a 71 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.
County Government. Arvada is located primarily in Jefferson County, Colorado. Jefferson County is the largest county in Colorado with a population estimated at 535,000. General boundaries for the county are W. 120th Ave. on the north, Sheridan Blvd. on the east, and Pike National Forest to the south. The county extends west into the mountains to meet Gilpin, Clear Creek and Park Counties. A small portion of southeast of Arvada is located in Adams County, Colorado.