| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 9°F | 26°F | 17°F | 1.0" |
| February | 13°F | 30°F | 21°F | 1.0" |
| March | 27°F | 48°F | 36°F | 6.5" |
| April | 37°F | 62°F | 49°F | 6.0" |
| May | 51°F | 73°F | 61°F | 5.9" |
| June | 61°F | 84°F | 72°F | 4.4" |
| July | 63°F | 87°F | 75°F | 7.6" |
| August | 61°F | 83°F | 71°F | 7.9" |
| September | 54°F | 79°F | 65°F | 6.8" |
| October | 41°F | 65°F | 52°F | 3.1" |
| November | 25°F | 47°F | 35°F | 3.7" |
| December | 9°F | 25°F | 17°F | 1.0" |
| Index | Greenville | Iowa | National |
| Air quality index | 35 | 39 | 50 |
| Pollution index | 769,697 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 322 |
| Days with moderate air quality | 42 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Ruthven, IA | 730 | 15 | 70% |
| Gillett Grove, IA | 35 | 35 | 30% |
| Linn Grove, IA | 140 | 35 | 30% |
| Sioux Rapids, IA | 729 | 35 | 30% |
| Everly, IA | 624 | 35 | 30% |
| Greenville, IA | 93 | 35 | 30% |
| City, State | Population | Air Quality Index | National Avg. |
| Bluff City, AR | 93 | 32 | 36% |
| Mapleton, KS | 93 | 37 | 26% |
| Soham, NM | 93 | 44 | 12% |
| Hockingport, OH | 93 | 35 | 30% |
| Woodman, WI | 93 | 29 | 42% |
| Greenville, IA | 93 | 35 | 30% |
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