When the sun goes down, evenings can be cool, so it might be advisable to have a light sweater on hand. Summer days in the mountains are quite pleasant. However, summer storms can arise suddenly and those who venture into the backcountry are strongly advised to have long pants, long-sleeved shirts, and a warm jacket close at hand. Fall weather in Denver is pleasantly similar to Spring with warm days and cool evenings. A visit to the mountains will generally require warmer clothing.
Winter days are generally a combination of warm sun and crisp air.
Daytime temperatures can vary from below freezing to above 60 degrees, so layers of medium weight clothing together with a warm jacket or overcoat are desirable. Remember, golf and tennis can be enjoyed year -round in Denver. Wintertime in the mountains can become very cool, but warm sunshine frequently makes the heaviest clothing unnecessary. Nevertheless, and particularly for evenings in the mountains, thermal underwear and very warm outer clothing such as heavy sweaters, ski jackets, and warm-up pants are advisable.