If you're looking for summer vibes, the best time to travel to Aspen, CO is in June, July and August, when the average temperature reaches 15.95 °C, while June, October and September are the 3 sunniest months of the year, with an average of 134.89 hours.
However, if you prefer colder temperatures, make sure you visit Aspen, CO during January, February or December to experience an average of -12.02 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, February and November, when the average precipitation in Aspen, CO is 2.3 mm, while the months of January, February and March are drier, with an average of 0 mm.