| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 41°F | 25°F | 1.2" |
| February | 19°F | 49°F | 32°F | 1.0" |
| March | 24°F | 59°F | 41°F | 0.5" |
| April | 29°F | 67°F | 48°F | 0.8" |
| May | 37°F | 76°F | 57°F | 0.8" |
| June | 46°F | 89°F | 69°F | 0.3" |
| July | 55°F | 92°F | 73°F | 1.4" |
| August | 52°F | 88°F | 70°F | 1.6" |
| September | 44°F | 81°F | 62°F | 1.5" |
| October | 32°F | 69°F | 49°F | 1.0" |
| November | 22°F | 56°F | 38°F | 0.7" |
| December | 16°F | 43°F | 28°F | 1.1" |
| Index | Lewis | Colorado | National |
| Air quality index | 44 | 38 | 42 |
| Pollution index | 639,508 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 276 |
| Days with moderate air quality | 89 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Cortez, CO | 8,729 | 44 | 12.0% |
| Dolores, CO | 1,017 | 44 | 12.0% |
| Lewis, CO | 186 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Cottonwood CDP, AZ | 186 | 43 | 14.0% |
| Poston, AZ | 186 | 13 | 74.0% |
| Nobleton, FL | 186 | 30 | 40.0% |
| Avalon, GA | 186 | 41 | 18.0% |
| Moore, ID | 186 | 27 | 46.0% |
| Lewis, CO | 186 | 44 | 12.0% |
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