| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 33°F | 22°F | 0.4" |
| February | 15°F | 37°F | 25°F | 0.7" |
| March | 29°F | 54°F | 40°F | 1.4" |
| April | 39°F | 66°F | 51°F | 3.5" |
| May | 51°F | 77°F | 63°F | 4.0" |
| June | 62°F | 86°F | 73°F | 5.1" |
| July | 65°F | 89°F | 76°F | 3.0" |
| August | 62°F | 85°F | 73°F | 4.9" |
| September | 53°F | 79°F | 65°F | 3.9" |
| October | 41°F | 67°F | 52°F | 2.4" |
| November | 28°F | 52°F | 39°F | 0.9" |
| December | 16°F | 36°F | 25°F | 1.2" |
| Index | Logan | Iowa | National |
| Air quality index | 40 | 39 | 42 |
| Pollution index | 4,349,930 | 1,154,535 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 283 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.210% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.100% |
| Mercury | 0.160% |
| City | Population | Air Quality Index | National Avg. |
| California Junction, IA | 40 | 40 | 20.0% |
| Persia, IA | 342 | 40 | 20.0% |
| Magnolia, IA | 144 | 40 | 20.0% |
| Woodbine, IA | 1,391 | 40 | 20.0% |
| Loveland, IA | 0 | 40 | 20.0% |
| Logan, IA | 1,544 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Verona, NY | 1,544 | 27 | 46.0% |
| Elizabethville, PA | 1,544 | 44 | 12.0% |
| Ripon, QC | 1,544 | n/a | |
| Foresthill, CA | 1,545 | 44 | 12.0% |
| Mount Airy, GA | 1,545 | 37 | 26.0% |
| Logan, IA | 1,544 | 40 | 20.0% |
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