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.
On average, there are  206 sunny days per year in Boise, Idaho. The July high is around 90 degrees. The January low is 23. Sperling's comfort index for Boise is a 72 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.