Keystone Weather. The best time of year to visit Keystone in United States of America. Keystone Resort serves all levels of skiers, from beginners to advanced, and a man-made lake is surrounded by attractive ski lodges. January 5. Weather in Keystone, Colorado. The area is less temperate than some — in the 20th percentile for pleasant weather — compared to tourist destinations worldwide. June 2. If you’re looking for the very warmest time to visit Keystone, the hottest months are July, August, and then June. See average monthly temperatures below. 970-368-7023 Call Now Vacation Planners Available 8a-9p Daily Perched above 10,000 feet in altitude, Keystone is one of Colorado's favorite ski resorts. The most pleasant months of the year for Keystone are July, August and June. Weeks with ideal weather are listed above. 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. February 5. March 9. When the calendar reaches June, July and August, it’s time for a family vacation or weekend getaway. Source: The Keystone, CO weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). But in the summer, the town breathes new life. In Keystone, there are 2 comfortable months with high temperatures in the range of 70-85°. With the enormous array of Keystone, CO, summer activities, the resort is a fantastic warm weather destination. Day to night, and hour by hour, temperature changes can be significant so always prepare for all types of weather throughout … December 6. 2019 102. 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). ... Dillon&Keystone Colorado July 28th; July 20. 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. Air quality and pollution levels measured in a particular area may not be representative of the entire county. Sitting at 9,173', the temperatures at Keystone range between 27-73 degrees in the summers and 0 to mid-40s in the winters. The mountain turns into a warm-weather wonderland. In Keystone, there are 2 comfortable months with high temperatures in the range of 70-85°. October 5. The town center hops with festivals and live music. With great weather that never gets too hot, summer activities abound and amazing festivals throughout the month, July in … November 19. The warm weather is back, patio and wildflower season is in full swing, and the trails are snow-free and ready for hiking and biking (but double-check before you go). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). 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