Longmont, Colorado, gets 13 inches of rain per year, while the US average is 37 inches. Snowfall is 34 inches, while the average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 67. On average, there are 247 sunny days per year in Longmont. The average temperature in Longmont for the year is 66 degrees. The July high is around 89 degrees, while the January low is 12.Located near the foothills of the Rocky Mountains, Longmont experiences four distinct seasons. The days are generally mild and the nights are cool. People from around the world come to Longmont to work and live, and most of them do not leave. That is part of the reason why entrepreneurship is very strong here.