Keystone, in Colorado, United States, is home to roughly 1,100 people in the Mountain Time Zone at 39.6°N latitude.
In 2025, Keystone recorded an average annual temperature of 36°F — about 0.9°F above the 30-year normal of 35°F. The hottest day reached 77°F in August; the coldest was -31°F in January. Total precipitation was 22 inches (wetter than usual). Snowfall totaled 48 inches, below the 157-inch average. The wettest month was March.
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