| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 27°F | 19°F | 1.8" |
| February | 16°F | 32°F | 23°F | 1.5" |
| March | 29°F | 47°F | 37°F | 2.9" |
| April | 39°F | 61°F | 49°F | 5.8" |
| May | 50°F | 72°F | 60°F | 5.9" |
| June | 60°F | 81°F | 70°F | 6.4" |
| July | 63°F | 83°F | 72°F | 7.0" |
| August | 61°F | 81°F | 70°F | 6.1" |
| September | 54°F | 75°F | 63°F | 3.9" |
| October | 42°F | 63°F | 51°F | 5.2" |
| November | 31°F | 48°F | 39°F | 4.8" |
| December | 19°F | 32°F | 25°F | 3.5" |
| Index | Shullsburg | Wisconsin | National |
| Air quality index | 29 | 69 | 42 |
| Pollution index | 938,326 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 60 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Apple Canyon Lake, IL | 639 | 29 | 42.0% |
| Scales Mound, IL | 502 | 29 | 42.0% |
| Platteville, WI | 12,113 | 29 | 42.0% |
| Galena, IL | 3,168 | 29 | 42.0% |
| Apple River, IL | 333 | 29 | 42.0% |
| Shullsburg, WI | 1,252 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Kotlik, AK | 1,252 | 31 | 38.0% |
| Weissport East, PA | 1,252 | 42 | 16.0% |
| Green Valley, SD | 1,252 | 44 | 12.0% |
| Iraan, TX | 1,252 | 28 | 44.0% |
| Georgetown, CT | 1,251 | 43 | 14.0% |
| Shullsburg, WI | 1,252 | 29 | 42.0% |
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