| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 23°F | 14°F | 1.2" |
| February | 8°F | 27°F | 17°F | 1.0" |
| March | 22°F | 42°F | 31°F | 2.4" |
| April | 34°F | 56°F | 44°F | 3.9" |
| May | 45°F | 69°F | 56°F | 7.5" |
| June | 54°F | 77°F | 65°F | 5.5" |
| July | 59°F | 82°F | 70°F | 6.6" |
| August | 57°F | 79°F | 67°F | 8.4" |
| September | 50°F | 72°F | 60°F | 5.7" |
| October | 38°F | 57°F | 47°F | 6.0" |
| November | 26°F | 43°F | 34°F | 2.3" |
| December | 12°F | 26°F | 19°F | 1.8" |
| Index | Grantsburg | Wisconsin | National |
| Air quality index | 46 | 69 | 42 |
| Pollution index | 1,318,690 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 214 |
| Days with moderate air quality | 148 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Pine City, MN | 3,113 | 32 | 36.0% |
| Siren, WI | 777 | 35 | 30.0% |
| Rush City, MN | 3,175 | 46 | 8.0% |
| Harris, MN | 988 | 46 | 8.0% |
| Frederic, WI | 1,171 | 46 | 8.0% |
| Grantsburg, WI | 1,279 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Litchfield, CT | 1,279 | 37 | 26.0% |
| Germantown, IL | 1,279 | 43 | 14.0% |
| Hurley, MS | 1,279 | 32 | 36.0% |
| Seven Points, TX | 1,279 | 41 | 18.0% |
| Berry Creek, CA | 1,278 | 46 | 8.0% |
| Grantsburg, WI | 1,279 | 46 | 8.0% |
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