| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 27°F | 20°F | 2.0" |
| February | 14°F | 29°F | 21°F | 2.4" |
| March | 27°F | 44°F | 34°F | 4.7" |
| April | 37°F | 57°F | 46°F | 6.9" |
| May | 48°F | 69°F | 57°F | 5.9" |
| June | 57°F | 78°F | 67°F | 8.3" |
| July | 61°F | 81°F | 70°F | 6.6" |
| August | 60°F | 79°F | 69°F | 4.8" |
| September | 52°F | 73°F | 62°F | 7.0" |
| October | 41°F | 60°F | 50°F | 5.5" |
| November | 30°F | 46°F | 37°F | 4.1" |
| December | 18°F | 32°F | 25°F | 2.6" |
| Index | Lowell | Wisconsin | National |
| Air quality index | 40 | 69 | 42 |
| Pollution index | 1,701,810 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 297 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hustisford, WI | 1,024 | 37 | 26.0% |
| Lebanon, WI | 100 | 37 | 26.0% |
| Ixonia, WI | 1,915 | 37 | 26.0% |
| Clyman, WI | 364 | 37 | 26.0% |
| Marshall, WI | 4,124 | 37 | 26.0% |
| Lowell, WI | 241 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| McGrath, AK | 241 | 31 | 38.0% |
| Fenton, IA | 241 | 15 | 70.0% |
| Winchester, ID | 241 | 29 | 42.0% |
| Yellow Pine, ID | 241 | 36 | 28.0% |
| Cleveland, IL | 241 | 46 | 8.0% |
| Lowell, WI | 241 | 40 | 20.0% |