| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 33°F | 19°F | 1.1" |
| February | 12°F | 37°F | 24°F | 0.9" |
| March | 20°F | 47°F | 33°F | 1.1" |
| April | 27°F | 55°F | 40°F | 1.8" |
| May | 34°F | 64°F | 48°F | 1.5" |
| June | 42°F | 78°F | 60°F | 0.7" |
| July | 48°F | 81°F | 64°F | 2.1" |
| August | 46°F | 78°F | 61°F | 1.5" |
| September | 39°F | 72°F | 54°F | 1.4" |
| October | 29°F | 59°F | 42°F | 1.5" |
| November | 19°F | 48°F | 32°F | 0.8" |
| December | 10°F | 34°F | 21°F | 1.1" |
| Index | Basalt | Colorado | National |
| Air quality index | 44 | 38 | 50 |
| Pollution index | 750,947 | 2,034,619 | 5,066,862 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 289 |
| Days with moderate air quality | 75 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Catherine, CO | 217 | 44 | 12% |
| Woody Creek, CO | 272 | 44 | 12% |
| Carbondale, CO | 6,571 | 44 | 12% |
| Cattle Creek, CO | 721 | 44 | 12% |
| Aspen, CO | 6,788 | 44 | 12% |
| Basalt, CO | 3,783 | 44 | 12% |
| City, State | Population | Air Quality Index | National Avg. |
| Hansville, WA | 3,783 | 45 | 10% |
| Evergreen, AL | 3,783 | 41 | 18% |
| Shallotte, NC | 3,784 | 34 | 32% |
| Yellow Springs, OH | 3,784 | 45 | 10% |
| Pelham, GA | 3,782 | 40 | 20% |
| Basalt, CO | 3,783 | 44 | 12% |
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