| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 30°F | 17°F | 1.4" |
| February | 7°F | 31°F | 18°F | 1.1" |
| March | 13°F | 39°F | 26°F | 1.3" |
| April | 19°F | 44°F | 31°F | 1.7" |
| May | 27°F | 55°F | 40°F | 1.4" |
| June | 34°F | 69°F | 53°F | 0.5" |
| July | 40°F | 72°F | 56°F | 1.9" |
| August | 38°F | 69°F | 53°F | 2.0" |
| September | 32°F | 63°F | 47°F | 1.4" |
| October | 24°F | 51°F | 37°F | 1.1" |
| November | 15°F | 41°F | 27°F | 1.0" |
| December | 6°F | 30°F | 18°F | 1.4" |
| Index | Keystone | Colorado | National |
| Air quality index | 47 | 38 | 42 |
| Pollution index | 736,431 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 227 |
| Days with moderate air quality | 133 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Copper Mountain, CO | 455 | 47 | 6.0% |
| Silverthorne, CO | 4,610 | 47 | 6.0% |
| Blue River, CO | 918 | 47 | 6.0% |
| Dillon, CO | 956 | 47 | 6.0% |
| Empire, CO | 410 | 47 | 6.0% |
| Keystone, CO | 799 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Upper Bear Creek, CO | 799 | 47 | 6.0% |
| Crossville, IL | 799 | 45 | 10.0% |
| Truesdale, MO | 799 | 54 | 8.0% |
| Lost City, OK | 799 | 36 | 28.0% |
| Brownstown borough, PA | 799 | 45 | 10.0% |
| Keystone, CO | 799 | 47 | 6.0% |
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