| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 28°F | 20°F | 1.7" |
| February | 14°F | 32°F | 23°F | 1.6" |
| March | 25°F | 45°F | 34°F | 3.4" |
| April | 36°F | 57°F | 45°F | 4.0" |
| May | 47°F | 71°F | 58°F | 4.5" |
| June | 57°F | 79°F | 67°F | 6.4" |
| July | 60°F | 84°F | 72°F | 5.9" |
| August | 60°F | 81°F | 69°F | 6.2" |
| September | 51°F | 73°F | 61°F | 4.4" |
| October | 41°F | 60°F | 50°F | 5.4" |
| November | 31°F | 48°F | 38°F | 4.2" |
| December | 20°F | 33°F | 26°F | 2.8" |
| Index | Thornton | Wisconsin | National |
| Air quality index | 37 | 69 | 42 |
| Pollution index | 1,864,330 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 59 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.070% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Gresham, WI | 511 | 34 | 32.0% |
| Middle Village, WI | 214 | 34 | 32.0% |
| Tilleda, WI | 78 | 34 | 32.0% |
| Bowler, WI | 345 | 34 | 32.0% |
| Zoar, WI | 164 | 34 | 32.0% |
| Thornton, WI | 47 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Goldville, AL | 47 | 38 | 24.0% |
| Martinez Lake, AZ | 47 | 45 | 10.0% |
| Garey, CA | 47 | 46 | 8.0% |
| New Pine Creek, CA | 47 | 29 | 42.0% |
| Paynes Creek, CA | 47 | 41 | 18.0% |
| Thornton, WI | 47 | 37 | 26.0% |
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