| 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 | Etna | Wyoming | National |
| Air quality index | 43 | 39 | 42 |
| Pollution index | 656,117 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Freedom, WY | 206 | 43 | 14.0% |
| Turnerville, WY | 94 | 43 | 14.0% |
| Nordic, WY | 310 | 43 | 14.0% |
| Alpine, WY | 719 | 43 | 14.0% |
| Star Valley Ranch, WY | 2,191 | 43 | 14.0% |
| Etna, WY | 0 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Chase, AK | 0 | 31 | 38.0% |
| Chiniak, AK | 0 | 31 | 38.0% |
| Chisana, AK | 0 | 31 | 38.0% |
| Dot Lake, AK | 0 | 38 | 24.0% |
| Eureka Roadhouse, AK | 0 | 31 | 38.0% |
| Etna, WY | 0 | 43 | 14.0% |
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