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| 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 | Allerton | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 141,634 | 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 | 0.004% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Clio, IA | 58 | 39 | 22.0% |
| Garden Grove, IA | 207 | 39 | 22.0% |
| Mercer, MO | 329 | 39 | 22.0% |
| Corydon, IA | 1,714 | 39 | 22.0% |
| Humeston, IA | 462 | 39 | 22.0% |
| Allerton, IA | 465 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Andrew, IA | 465 | 42 | 16.0% |
| Colony, KS | 465 | 22 | 56.0% |
| Phelps, KY | 465 | 295 | 490.0% |
| Henrietta, NC | 465 | 36 | 28.0% |
| Petersburg, NE | 465 | 19 | 62.0% |
| Allerton, IA | 465 | 39 | 22.0% |
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