Denver is situated on the high plains at the base of the Rocky Mountains and has a mild, semi-arid climate all year long.
Historically, no day in Denver is the same:
Wear layers (days may be warm, but nights tend to get chilly)
Be prepared for weather changing often and quickly
Expect temperatures in the mountains to be lower than in the city
Denver has four distinct seasons. Fall and springtime bring the most weather variety and conditions can vary greatly. During the winter the snow and extreme cold stays mostly in the mountains. Denver snowstorms are normally short-lived and snow melts quickly. Summer days are dry with temperatures usually in the 80s and 90s and summer nights are cool and comfortable.
Denver is best known for its 300 days of sunshine and low humidity, providing an ideal climate for year-round activities.