| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 0.8" |
| February | 25°F | 43°F | 33°F | 0.6" |
| March | 33°F | 52°F | 41°F | 3.0" |
| April | 42°F | 63°F | 52°F | 3.6" |
| May | 50°F | 72°F | 61°F | 4.5" |
| June | 62°F | 84°F | 73°F | 5.6" |
| July | 65°F | 83°F | 74°F | 8.8" |
| August | 62°F | 81°F | 71°F | 5.3" |
| September | 57°F | 80°F | 68°F | 3.4" |
| October | 48°F | 68°F | 57°F | 4.2" |
| November | 33°F | 52°F | 42°F | 0.9" |
| December | 18°F | 33°F | 25°F | 0.9" |
| Index | Wilton | Iowa | National |
| Air quality index | 32 | 39 | 42 |
| Pollution index | 4,306,550 | 1,154,535 | 2,726,193 |
| 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 | 0.090% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.140% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Rochester, IA | 97 | 32 | 36.0% |
| Muscatine, IA | 23,661 | 32 | 36.0% |
| Atalissa, IA | 353 | 32 | 36.0% |
| West Liberty, IA | 3,750 | 32 | 36.0% |
| Durant, IA | 1,878 | 32 | 36.0% |
| Wilton, IA | 2,845 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Filer, ID | 2,845 | 20 | 60.0% |
| McDougall, ON | 2,845 | n/a | |
| Cetronia, PA | 2,844 | 42 | 16.0% |
| Lanai City, HI | 2,846 | 15 | 70.0% |
| Ketchum, ID | 2,843 | 20 | 60.0% |
| Wilton, IA | 2,845 | 32 | 36.0% |
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