| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 1°F | 24°F | 12°F | 3.4" |
| February | 3°F | 28°F | 15°F | 2.3" |
| March | 9°F | 36°F | 22°F | 2.3" |
| April | 17°F | 43°F | 29°F | 2.5" |
| May | 26°F | 52°F | 38°F | 2.5" |
| June | 33°F | 64°F | 48°F | 2.2" |
| July | 39°F | 74°F | 56°F | 1.5" |
| August | 37°F | 72°F | 54°F | 1.4" |
| September | 31°F | 63°F | 45°F | 1.7" |
| October | 24°F | 48°F | 34°F | 2.2" |
| November | 13°F | 34°F | 23°F | 2.3" |
| December | 3°F | 23°F | 13°F | 3.1" |
| Index | Mammoth | Wyoming | National |
| Air quality index | 25 | 39 | 42 |
| Pollution index | 3,657,990 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 337 |
| Days with moderate air quality | 28 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.040% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Corwin Springs, MT | 110 | 25 | 50.0% |
| Gardiner, MT | 893 | 25 | 50.0% |
| Jardine, MT | 41 | 25 | 50.0% |
| Mammoth, WY | 83 | 25 | 50.0% |
| City | Population | Air Quality Index | National Avg. |
| Gulkana, AK | 83 | 31 | 38.0% |
| Pilot Point, AK | 83 | 31 | 38.0% |
| Higden, AR | 83 | 45 | 10.0% |
| Patmos, AR | 83 | 39 | 22.0% |
| Ledyard, IA | 83 | 15 | 70.0% |
| Mammoth, WY | 83 | 25 | 50.0% |
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