| 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 | Madison | 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. |
| Stoughton, WI | 13,146 | 39 | 22.0% |
| Cross Plains, WI | 4,234 | 39 | 22.0% |
| Windsor, WI | 7,340 | 39 | 22.0% |
| Middleton, WI | 19,764 | 39 | 22.0% |
| Sun Prairie, WI | 33,954 | 39 | 22.0% |
| Madison, WI | 258,366 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Burnaby, BC | 258,827 | n/a | |
| Kitchener, ON | 259,162 | n/a | |
| Chandler, AZ | 257,076 | 74 | 48.0% |
| Lubbock, TX | 257,013 | 25 | 50.0% |
| Laredo, TX | 260,571 | 41 | 18.0% |
| Madison, WI | 258,366 | 39 | 22.0% |
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