| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 33°F | 24°F | 2.8" |
| February | 20°F | 37°F | 27°F | 3.3" |
| March | 33°F | 55°F | 43°F | 3.3" |
| April | 42°F | 63°F | 51°F | 6.4" |
| May | 53°F | 74°F | 63°F | 7.9" |
| June | 63°F | 82°F | 72°F | 9.5" |
| July | 66°F | 87°F | 76°F | 3.7" |
| August | 67°F | 87°F | 76°F | 10.2" |
| September | 57°F | 79°F | 67°F | 7.1" |
| October | 46°F | 66°F | 55°F | 5.5" |
| November | 32°F | 52°F | 41°F | 3.2" |
| December | 18°F | 33°F | 25°F | 3.4" |
| Index | Leon | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 648,829 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 306 |
| Days with moderate air quality | 59 |
| 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 | Population | Air Quality Index | National Avg. |
| Le Roy, IA | 1 | 39 | 22.0% |
| Grand River, IA | 193 | 39 | 22.0% |
| Pleasanton, IA | 51 | 39 | 22.0% |
| Decatur City, IA | 192 | 39 | 22.0% |
| Van Wert, IA | 137 | 39 | 22.0% |
| Leon, IA | 1,883 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Manteo, NC | 1,883 | 40 | 20.0% |
| Freeland, WA | 1,883 | 24 | 52.0% |
| Cairo, IL | 1,884 | 44 | 12.0% |
| Ridgely, TN | 1,882 | 26 | 48.0% |
| Anson, TX | 1,884 | 26 | 48.0% |
| Leon, IA | 1,883 | 39 | 22.0% |
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