| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 29°F | 21°F | 2.7" |
| February | 15°F | 33°F | 24°F | 1.9" |
| March | 23°F | 42°F | 33°F | 2.3" |
| April | 30°F | 54°F | 43°F | 3.1" |
| May | 37°F | 63°F | 52°F | 3.6" |
| June | 45°F | 76°F | 63°F | 3.3" |
| July | 53°F | 86°F | 74°F | 1.0" |
| August | 49°F | 84°F | 70°F | 1.7" |
| September | 40°F | 74°F | 60°F | 3.8" |
| October | 32°F | 57°F | 45°F | 2.8" |
| November | 23°F | 43°F | 34°F | 2.2" |
| December | 16°F | 31°F | 23°F | 1.5" |
| Index | Afton | Wyoming | National |
| Air quality index | 43 | 39 | 42 |
| Pollution index | 971,862 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 39 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Grover, WY | 875 | 43 | 14.0% |
| Fairview, WY | 78 | 43 | 14.0% |
| Smoot, WY | 369 | 43 | 14.0% |
| Osmond, WY | 828 | 43 | 14.0% |
| Auburn, WY | 631 | 43 | 14.0% |
| Afton, WY | 1,984 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Old Saybrook Center, CT | 1,984 | 37 | 26.0% |
| Lenox, MA | 1,984 | 37 | 26.0% |
| Berwick, ME | 1,985 | 27 | 46.0% |
| Tylertown, MS | 1,985 | 30 | 40.0% |
| West Tawakoni, TX | 1,985 | 51 | 2.0% |
| Afton, WY | 1,984 | 43 | 14.0% |
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