July is the hottest month for Keystone with an average high temperature of 74.9°, which ranks it as one of the coolest places in Colorado. July is the hottest month for Keystone with an average high temperature of 74.9°, which ranks it as one of the coolest places in Colorado. The most pleasant months of the year for Keystone are July, August and June. But in the summer, the town breathes new life. See average monthly temperatures below. August 15. With the enormous array of Keystone, CO, summer activities, the resort is a fantastic warm weather destination. The lake, one of the nation's largest groomed skating ponds, is popular with ice skaters in winter and paddle-boaters in summer — just don't run over the ducks. October 5. Perched above 10,000 feet in altitude, Keystone is one of Colorado's favorite ski resorts. Weather in Keystone, Colorado. Air quality and pollution levels measured in a particular area may not be representative of the entire county. June 2. December 6. April 7. January 5. September 6. March 9. 970-368-7023 Call Now Vacation Planners Available 8a-9p Daily Keystone Resort Summer things to do and activities for you and your family to enjoy on your summer vacation in Keystone Colorado. The weather was unpredictable for us today but we decided to hook up with Rick and his son Anders for a hike, hoping to get in as much of the trail as possible! With great weather that never gets too hot, summer activities abound and amazing festivals throughout the month, July in … Here are some average weather facts we collected from our historical climate data: During the month of July and August you are most likely to experience good weather with pleasant average temperatures that fall between 20 degrees Celsius (68°F) and 25 degrees Celsius (77°F). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). February 5. May 6. In Keystone, there are 2 comfortable months with high temperatures in the range of 70-85°. Keystone Weather. The best time of year to visit Keystone in United States of America. If you’re looking for the very warmest time to visit Keystone, the hottest months are July, August, and then June. 2019 102. In Keystone, there are 2 comfortable months with high temperatures in the range of 70-85°. November 19. ... Dillon&Keystone Colorado July 28th; July 20. Sitting at 9,173', the temperatures at Keystone range between 27-73 degrees in the summers and 0 to mid-40s in the winters. Source: The Keystone, CO weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). The mountain turns into a warm-weather wonderland. The town center hops with festivals and live music. Keystone Resort serves all levels of skiers, from beginners to advanced, and a man-made lake is surrounded by attractive ski lodges. 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