| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 23°F | 14°F | 1.1" |
| February | 7°F | 27°F | 16°F | 2.4" |
| March | 22°F | 42°F | 31°F | 2.6" |
| April | 35°F | 56°F | 44°F | 3.5" |
| May | 45°F | 68°F | 56°F | 7.4" |
| June | 55°F | 77°F | 65°F | 3.9" |
| July | 59°F | 81°F | 70°F | 6.0" |
| August | 57°F | 78°F | 67°F | 6.3" |
| September | 49°F | 71°F | 59°F | 4.5" |
| October | 38°F | 57°F | 47°F | 5.5" |
| November | 27°F | 43°F | 34°F | 4.7" |
| December | 12°F | 27°F | 20°F | 2.9" |
| Index | Birchwood | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 1,188,950 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 305 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Couderay, WI | 85 | 34 | 32.0% |
| Stone Lake, WI | 115 | 34 | 32.0% |
| Exeland, WI | 228 | 34 | 32.0% |
| Haugen, WI | 263 | 34 | 32.0% |
| Bruce, WI | 813 | 34 | 32.0% |
| Birchwood, WI | 345 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Iliff, CO | 345 | 19 | 62.0% |
| Odum, GA | 345 | 36 | 28.0% |
| West Okoboji, IA | 345 | 36 | 28.0% |
| Buffalo, IL | 345 | 40 | 20.0% |
| Loda, IL | 345 | 42 | 16.0% |
| Birchwood, WI | 345 | 34 | 32.0% |
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