| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 24°F | 16°F | 0.5" |
| February | 9°F | 27°F | 18°F | 0.4" |
| March | 23°F | 42°F | 32°F | 1.0" |
| April | 35°F | 57°F | 45°F | 2.4" |
| May | 46°F | 69°F | 57°F | 3.1" |
| June | 56°F | 77°F | 66°F | 3.8" |
| July | 59°F | 82°F | 70°F | 3.4" |
| August | 58°F | 79°F | 68°F | 3.1" |
| September | 50°F | 72°F | 60°F | 2.9" |
| October | 39°F | 58°F | 48°F | 2.4" |
| November | 27°F | 44°F | 35°F | 0.9" |
| December | 14°F | 28°F | 21°F | 1.0" |
| Index | Hewitt | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 4,420,090 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 205 |
| Days with good air quality | 196 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Marshfield, WI | 18,214 | 34 | 32.0% |
| Spencer, WI | 1,690 | 34 | 32.0% |
| Vesper, WI | 520 | 34 | 32.0% |
| Pittsville, WI | 889 | 34 | 32.0% |
| Unity, WI | 353 | 34 | 32.0% |
| Hewitt, WI | 1,016 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Merrill, IA | 1,016 | 35 | 30.0% |
| Burrton, KS | 1,016 | 40 | 20.0% |
| Mount Vernon, MD | 1,016 | 41 | 18.0% |
| New Franklin, MO | 1,016 | 38 | 24.0% |
| Greene, RI | 1,016 | 44 | 12.0% |
| Hewitt, WI | 1,016 | 34 | 32.0% |
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