| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 37°F | 19°F | 0.3" |
| February | 17°F | 44°F | 28°F | 0.2" |
| March | 28°F | 61°F | 41°F | 3.1" |
| April | 34°F | 66°F | 48°F | 2.5" |
| May | 43°F | 76°F | 58°F | 3.0" |
| June | 51°F | 86°F | 67°F | 12.6" |
| July | 58°F | 95°F | 75°F | 5.0" |
| August | 55°F | 90°F | 70°F | 4.3" |
| September | 47°F | 84°F | 62°F | 3.5" |
| October | 36°F | 71°F | 49°F | 1.4" |
| November | 24°F | 59°F | 37°F | 0.5" |
| December | 9°F | 39°F | 21°F | 1.0" |
| Index | Eaton | Colorado | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 2,940,130 | 2,068,342 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 252 |
| Days with moderate air quality | 110 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Johnstown, CO | 14,357 | 45 | 10.0% |
| Garden City, CO | 208 | 45 | 10.0% |
| Ault, CO | 2,153 | 45 | 10.0% |
| Pierce, CO | 1,352 | 45 | 10.0% |
| Milliken, CO | 7,862 | 45 | 10.0% |
| Eaton, CO | 5,646 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Marion, VA | 5,646 | 26 | 48.0% |
| Carlinville, IL | 5,645 | 40 | 20.0% |
| Solvang, CA | 5,644 | 44 | 12.0% |
| Malone, NY | 5,644 | 0 | 100.0% |
| Oliver, BC | 5,648 | n/a | |
| Eaton, CO | 5,646 | 45 | 10.0% |
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