| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 34°F | 21°F | 3.2" |
| February | 13°F | 37°F | 25°F | 1.7" |
| March | 20°F | 46°F | 32°F | 1.9" |
| April | 28°F | 56°F | 41°F | 2.5" |
| May | 35°F | 65°F | 50°F | 2.5" |
| June | 41°F | 75°F | 58°F | 2.0" |
| July | 48°F | 84°F | 65°F | 3.1" |
| August | 47°F | 78°F | 62°F | 1.6" |
| September | 40°F | 71°F | 55°F | 4.1" |
| October | 30°F | 59°F | 42°F | 4.5" |
| November | 19°F | 47°F | 31°F | 1.8" |
| December | 7°F | 31°F | 19°F | 2.6" |
| Index | Aspen | Colorado | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 750,947 | 2,068,342 | 2,726,193 |
| 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 | Population | Air Quality Index | National Avg. |
| Woody Creek, CO | 212 | 44 | 12.0% |
| Snowmass Village, CO | 2,786 | 44 | 12.0% |
| Basalt, CO | 3,941 | 44 | 12.0% |
| El Jebel, CO | 4,349 | 44 | 12.0% |
| Norrie, CO | 0 | 47 | 6.0% |
| Aspen, CO | 7,721 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Leola, PA | 7,720 | 45 | 10.0% |
| Waite Park, MN | 7,719 | 32 | 36.0% |
| Wellington, KS | 7,716 | 40 | 20.0% |
| Union, SC | 7,716 | 44 | 12.0% |
| Fort Scott, KS | 7,715 | 37 | 26.0% |
| Aspen, CO | 7,721 | 44 | 12.0% |
Here are the best places to live in Colorado
Check out the 10 safest cities in Colorado
See the best places to live in & around Aspen
10 Best cities in Colorado for employment