| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 31°F | 21°F | 0.4" |
| February | 16°F | 33°F | 24°F | 0.4" |
| March | 23°F | 43°F | 32°F | 0.5" |
| April | 28°F | 52°F | 39°F | 0.9" |
| May | 36°F | 62°F | 48°F | 1.9" |
| June | 45°F | 75°F | 60°F | 0.8" |
| July | 53°F | 84°F | 68°F | 0.5" |
| August | 51°F | 82°F | 66°F | 0.9" |
| September | 43°F | 72°F | 56°F | 1.3" |
| October | 33°F | 58°F | 44°F | 0.9" |
| November | 23°F | 45°F | 33°F | 0.5" |
| December | 14°F | 31°F | 22°F | 0.4" |
| Index | Lyman | Wyoming | National |
| Air quality index | 44 | 39 | 42 |
| Pollution index | 902,446 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 315 |
| Days with moderate air quality | 49 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Robertson, WY | 37 | 44 | 12.0% |
| Mountain View, WY | 1,042 | 44 | 12.0% |
| Carter, WY | 0 | 44 | 12.0% |
| Urie, WY | 327 | 44 | 12.0% |
| Fort Bridger, WY | 100 | 44 | 12.0% |
| Lyman, WY | 1,723 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Duxbury, MA | 1,723 | 43 | 14.0% |
| Lakeland, MN | 1,723 | 46 | 8.0% |
| Bay Springs, MS | 1,723 | 36 | 28.0% |
| Roundup, MT | 1,723 | 21 | 58.0% |
| Hazen, AR | 1,724 | 45 | 10.0% |
| Lyman, WY | 1,723 | 44 | 12.0% |
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