| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 23°F | 15°F | 0.5" |
| February | 8°F | 26°F | 17°F | 0.5" |
| March | 22°F | 40°F | 30°F | 1.2" |
| April | 34°F | 54°F | 43°F | 2.4" |
| May | 45°F | 67°F | 55°F | 3.8" |
| June | 54°F | 75°F | 64°F | 4.8" |
| July | 58°F | 80°F | 69°F | 3.4" |
| August | 56°F | 77°F | 66°F | 4.6" |
| September | 48°F | 70°F | 58°F | 3.3" |
| October | 38°F | 56°F | 46°F | 3.2" |
| November | 27°F | 41°F | 33°F | 1.4" |
| December | 13°F | 26°F | 19°F | 1.6" |
| Index | Chelsea | Wisconsin | National |
| Air quality index | 34 | 69 | 42 |
| Pollution index | 765,134 | 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 | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Westboro, WI | 186 | 34 | 32.0% |
| Whittlesey, WI | 122 | 34 | 32.0% |
| Medford, WI | 4,285 | 34 | 32.0% |
| Rib Lake, WI | 930 | 34 | 32.0% |
| Ogema, WI | 192 | 34 | 32.0% |
| Chelsea, WI | 89 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Chuathbaluk, AK | 89 | 31 | 38.0% |
| Allport, AR | 89 | 45 | 10.0% |
| South Lead Hill, AR | 89 | 36 | 28.0% |
| Rockingham, GA | 89 | 26 | 48.0% |
| Jackson Junction, IA | 89 | 39 | 22.0% |
| Chelsea, WI | 89 | 34 | 32.0% |
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