| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 31°F | 22°F | 2.9" |
| February | 18°F | 35°F | 26°F | 1.6" |
| March | 30°F | 49°F | 38°F | 2.6" |
| April | 38°F | 61°F | 48°F | 5.8" |
| May | 50°F | 74°F | 61°F | 5.4" |
| June | 59°F | 83°F | 71°F | 6.3" |
| July | 66°F | 90°F | 78°F | 3.9" |
| August | 61°F | 85°F | 72°F | 5.2" |
| September | 51°F | 74°F | 62°F | 2.8" |
| October | 40°F | 63°F | 51°F | 8.9" |
| November | 33°F | 51°F | 41°F | 2.9" |
| December | 20°F | 35°F | 27°F | 3.2" |
| Index | Middleton | Wisconsin | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,728,820 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 80 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Prairie du Sac, WI | 4,397 | 35 | 30.0% |
| Sauk City, WI | 3,481 | 35 | 30.0% |
| Lodi, WI | 3,073 | 35 | 30.0% |
| Waunakee, WI | 13,903 | 39 | 22.0% |
| Mount Horeb, WI | 7,494 | 39 | 22.0% |
| Middleton, WI | 19,764 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Bartow, FL | 19,762 | 36 | 28.0% |
| Seymour, IN | 19,780 | 35 | 30.0% |
| Blythe, CA | 19,747 | 13 | 74.0% |
| Sherwood, OR | 19,745 | 38 | 24.0% |
| Mont-Saint-Hilaire, QC | 19,745 | n/a | |
| Middleton, WI | 19,764 | 39 | 22.0% |
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