| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 32°F | 22°F | 0.5" |
| February | 16°F | 34°F | 25°F | 0.4" |
| March | 22°F | 45°F | 33°F | 1.0" |
| April | 27°F | 55°F | 40°F | 1.1" |
| May | 35°F | 65°F | 50°F | 1.5" |
| June | 44°F | 77°F | 60°F | 1.2" |
| July | 52°F | 87°F | 70°F | 1.0" |
| August | 49°F | 83°F | 66°F | 0.7" |
| September | 41°F | 72°F | 56°F | 1.2" |
| October | 31°F | 56°F | 42°F | 1.1" |
| November | 24°F | 46°F | 35°F | 0.3" |
| December | 11°F | 29°F | 20°F | 0.7" |
| Index | Sinclair | Wyoming | National |
| Air quality index | 42 | 39 | 42 |
| Pollution index | 1,128,450 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 327 |
| Days with moderate air quality | 37 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Rawlins, WY | 8,716 | 42 | 16.0% |
| Sinclair, WY | 435 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Havana, AR | 435 | 36 | 28.0% |
| Horseshoe Lake, AR | 435 | 45 | 10.0% |
| Manzanola, CO | 435 | 20 | 60.0% |
| Spring Grove, IN | 435 | 6 | 88.0% |
| Tolchester, MD | 435 | 46 | 8.0% |
| Sinclair, WY | 435 | 42 | 16.0% |
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