| 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. |
| Promise City, IA | 72 | 39 | 22.0% |
| Le Roy, IA | 1 | 39 | 22.0% |
| South Lineville, MO | 3 | 39 | 22.0% |
| Seymour, IA | 521 | 39 | 22.0% |
| Millerton, IA | 125 | 39 | 22.0% |
| Allerton, IA | 453 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Boulevard, CA | 453 | 58 | 16.0% |
| Argyle, GA | 453 | 26 | 48.0% |
| Martin, GA | 453 | 41 | 18.0% |
| Riley, IN | 453 | 45 | 10.0% |
| Essex, MO | 453 | 26 | 48.0% |
| Allerton, IA | 453 | 39 | 22.0% |
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