| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 38°F | 26°F | 0.1" |
| February | 19°F | 39°F | 28°F | 0.2" |
| March | 28°F | 52°F | 39°F | 0.3" |
| April | 33°F | 56°F | 43°F | 1.5" |
| May | 41°F | 65°F | 52°F | 2.3" |
| June | 51°F | 77°F | 63°F | 1.2" |
| July | 58°F | 86°F | 72°F | 0.8" |
| August | 55°F | 83°F | 69°F | 1.1" |
| September | 47°F | 74°F | 59°F | 1.1" |
| October | 37°F | 58°F | 46°F | 1.1" |
| November | 26°F | 47°F | 36°F | 0.2" |
| December | 14°F | 35°F | 24°F | 0.1" |
| Index | Powell | Wyoming | National |
| Air quality index | 21 | 39 | 42 |
| Pollution index | 218,962 | 1,779,975 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 357 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Byron, WY | 493 | 21 | 58.0% |
| Garland, WY | 193 | 21 | 58.0% |
| Cowley, WY | 667 | 21 | 58.0% |
| Ralston, WY | 432 | 21 | 58.0% |
| Deaver, WY | 111 | 21 | 58.0% |
| Powell, WY | 6,238 | 21 | 58.0% |
| City | Population | Air Quality Index | National Avg. |
| Gulf Park Estates, MS | 6,238 | 32 | 36.0% |
| Wailea, HI | 6,239 | 15 | 70.0% |
| Ashton-Sandy Spring, MD | 6,239 | 47 | 6.0% |
| Prairie Grove, AR | 6,236 | 44 | 12.0% |
| Vine Grove, KY | 6,234 | 39 | 22.0% |
| Powell, WY | 6,238 | 21 | 58.0% |
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