| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 32°F | 23°F | 1.0" |
| February | 17°F | 35°F | 25°F | 1.1" |
| March | 30°F | 51°F | 39°F | 2.4" |
| April | 41°F | 64°F | 52°F | 4.8" |
| May | 51°F | 74°F | 62°F | 4.6" |
| June | 62°F | 84°F | 73°F | 6.1" |
| July | 66°F | 86°F | 75°F | 4.7" |
| August | 64°F | 84°F | 73°F | 4.5" |
| September | 55°F | 78°F | 66°F | 3.3" |
| October | 43°F | 65°F | 53°F | 3.3" |
| November | 31°F | 51°F | 40°F | 1.9" |
| December | 19°F | 35°F | 27°F | 1.9" |
| Index | Conesville | Iowa | National |
| Air quality index | 32 | 39 | 50 |
| Pollution index | 975,807 | 1,643,836 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 300 |
| Days with moderate air quality | 65 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.040% |
| Mercury | 0.150% |
| City, State | Population | Air Quality Index | National Avg. |
| Nichols, IA | 360 | 32 | 36% |
| Cotter, IA | 38 | 32 | 36% |
| Letts, IA | 410 | 32 | 36% |
| Crawfordsville, IA | 261 | 32 | 36% |
| Wapello, IA | 1,922 | 32 | 36% |
| Conesville, IA | 617 | 32 | 36% |
| City, State | Population | Air Quality Index | National Avg. |
| Russia, OH | 617 | 47 | 6% |
| Olive Branch, IL | 617 | 44 | 12% |
| Eminence, MO | 617 | 39 | 22% |
| Ravenna, KY | 617 | 33 | 34% |
| Tekonsha, MI | 617 | 38 | 24% |
| Conesville, IA | 617 | 32 | 36% |
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