| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 29°F | 21°F | 1.4" |
| February | 14°F | 32°F | 22°F | 1.1" |
| March | 28°F | 47°F | 37°F | 2.8" |
| April | 39°F | 61°F | 49°F | 4.6" |
| May | 50°F | 72°F | 60°F | 5.1" |
| June | 60°F | 80°F | 69°F | 8.0" |
| July | 63°F | 84°F | 73°F | 5.2" |
| August | 61°F | 82°F | 71°F | 5.1" |
| September | 54°F | 76°F | 63°F | 4.2" |
| October | 43°F | 63°F | 52°F | 4.1" |
| November | 31°F | 49°F | 39°F | 3.2" |
| December | 18°F | 33°F | 26°F | 3.2" |
| Index | Greeley | Iowa | National |
| Air quality index | 29 | 39 | 42 |
| Pollution index | 586,175 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.090% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Edgewood, IA | 574 | 29 | 42.0% |
| Dyersville, IA | 4,131 | 29 | 42.0% |
| Elkport, IA | 18 | 29 | 42.0% |
| New Vienna, IA | 401 | 29 | 42.0% |
| Garber, IA | 104 | 29 | 42.0% |
| Greeley, IA | 321 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Kiron, IA | 321 | 35 | 30.0% |
| Kampsville, IL | 321 | 54 | 8.0% |
| New Douglas, IL | 321 | 54 | 8.0% |
| Milton, IN | 321 | 6 | 88.0% |
| Creighton, MO | 321 | 47 | 6.0% |
| Greeley, IA | 321 | 29 | 42.0% |
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