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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 35°F | 23°F | 0.9" |
| February | 17°F | 39°F | 26°F | 1.2" |
| March | 30°F | 54°F | 41°F | 2.2" |
| April | 41°F | 67°F | 53°F | 4.9" |
| May | 51°F | 76°F | 63°F | 4.9" |
| June | 62°F | 86°F | 74°F | 6.5" |
| July | 66°F | 89°F | 77°F | 4.2" |
| August | 64°F | 87°F | 75°F | 5.1" |
| September | 56°F | 81°F | 68°F | 3.7" |
| October | 43°F | 68°F | 55°F | 3.2" |
| November | 31°F | 54°F | 42°F | 1.8" |
| December | 18°F | 38°F | 27°F | 2.1" |
| Index | Winterset | Iowa | National |
| Air quality index | 39 | 39 | 42 |
| Pollution index | 1,337,380 | 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 | 0.040% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.190% |
| Mercury | 0.160% |
| City | Population | Air Quality Index | National Avg. |
| Cumming, IA | 536 | 39 | 22.0% |
| Earlham, IA | 1,382 | 39 | 22.0% |
| St. Marys, IA | 182 | 39 | 22.0% |
| Martensdale, IA | 504 | 39 | 22.0% |
| De Soto, IA | 987 | 39 | 22.0% |
| Winterset, IA | 5,309 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Sunset, UT | 5,309 | 45 | 10.0% |
| Tillamook, OR | 5,308 | 32 | 36.0% |
| Colona, IL | 5,307 | 46 | 8.0% |
| Richlands, VA | 5,311 | 45 | 10.0% |
| Country Knolls, NY | 5,306 | 37 | 26.0% |
| Winterset, IA | 5,309 | 39 | 22.0% |
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