| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 24°F | 15°F | 1.6" |
| February | 7°F | 28°F | 17°F | 1.1" |
| March | 22°F | 42°F | 31°F | 3.5" |
| April | 33°F | 56°F | 44°F | 5.1" |
| May | 43°F | 69°F | 56°F | 5.7" |
| June | 53°F | 77°F | 65°F | 5.6" |
| July | 59°F | 82°F | 70°F | 6.1" |
| August | 56°F | 79°F | 67°F | 8.6" |
| September | 49°F | 72°F | 59°F | 5.6" |
| October | 38°F | 57°F | 47°F | 6.1" |
| November | 26°F | 43°F | 34°F | 3.3" |
| December | 12°F | 27°F | 20°F | 2.5" |
| Index | Siren | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 1,410,450 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 38 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Webster, WI | 660 | 35 | 30.0% |
| Lewis, WI | 146 | 46 | 8.0% |
| Luck, WI | 1,170 | 46 | 8.0% |
| Grantsburg, WI | 1,279 | 46 | 8.0% |
| Frederic, WI | 1,171 | 46 | 8.0% |
| Siren, WI | 777 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Hobson City, AL | 777 | 38 | 24.0% |
| Laytonville, CA | 777 | 33 | 34.0% |
| Mound City, IL | 777 | 44 | 12.0% |
| Newman, IL | 777 | 42 | 16.0% |
| Tonica, IL | 777 | 0 | 100.0% |
| Siren, WI | 777 | 35 | 30.0% |
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