| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 24°F | 16°F | 1.4" |
| February | 13°F | 30°F | 22°F | 4.1" |
| March | 24°F | 43°F | 32°F | 4.1" |
| April | 30°F | 52°F | 40°F | 4.4" |
| May | 41°F | 65°F | 52°F | 5.1" |
| June | 50°F | 74°F | 62°F | 7.3" |
| July | 54°F | 79°F | 67°F | 4.9" |
| August | 52°F | 75°F | 63°F | 5.4" |
| September | 47°F | 70°F | 57°F | 3.0" |
| October | 35°F | 55°F | 44°F | 5.5" |
| November | 25°F | 42°F | 33°F | 3.3" |
| December | 13°F | 27°F | 20°F | 3.6" |
| Index | Mercer | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 3,778,420 | 2,842,418 | 2,726,193 |
| Measurement | Total |
| Days measured | 205 |
| Days with good air quality | 196 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Lac du Flambeau, WI | 1,737 | 34 | 32.0% |
| Mercer, WI | 507 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Hytop, AL | 507 | 44 | 12.0% |
| Cotton Plant, AR | 507 | 45 | 10.0% |
| Holland, AR | 507 | 45 | 10.0% |
| Rose Bud, AR | 507 | 45 | 10.0% |
| Brooks, GA | 507 | 52 | 4.0% |
| Mercer, WI | 507 | 34 | 32.0% |
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