| 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 | Greeley | Colorado | National |
| Air quality index | 45 | 38 | 42 |
| Pollution index | 79,520 | 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 | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Gilcrest, CO | 1,381 | 45 | 10.0% |
| Platteville, CO | 3,017 | 45 | 10.0% |
| La Salle, CO | 3,377 | 45 | 10.0% |
| Johnstown, CO | 14,357 | 45 | 10.0% |
| Evans, CO | 22,128 | 45 | 10.0% |
| Greeley, CO | 107,445 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Daly City, CA | 107,197 | 40 | 20.0% |
| Lewisville, TX | 107,740 | 51 | 2.0% |
| Meridian, ID | 107,787 | 36 | 28.0% |
| Waterbury, CT | 107,841 | 41 | 18.0% |
| Highlands Ranch, CO | 107,017 | 58 | 16.0% |
| Greeley, CO | 107,445 | 45 | 10.0% |
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