| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 23°F | 15°F | 2.5" |
| February | 9°F | 25°F | 17°F | 1.9" |
| March | 19°F | 39°F | 28°F | 1.9" |
| April | 30°F | 54°F | 41°F | 3.0" |
| May | 42°F | 65°F | 52°F | 3.6" |
| June | 52°F | 77°F | 63°F | 6.3" |
| July | 56°F | 81°F | 68°F | 4.6" |
| August | 55°F | 78°F | 66°F | 3.6" |
| September | 50°F | 72°F | 60°F | 4.7" |
| October | 40°F | 58°F | 48°F | 9.4" |
| November | 26°F | 40°F | 32°F | 1.7" |
| December | 12°F | 25°F | 19°F | 2.1" |
| Index | Bayfield | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 1,621,010 | 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 | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Odanah, WI | 51 | 35 | 30.0% |
| Cornucopia, WI | 88 | 35 | 30.0% |
| Washburn, WI | 1,844 | 35 | 30.0% |
| Diaperville, WI | 21 | 35 | 30.0% |
| New Odanah, WI | 384 | 35 | 30.0% |
| Bayfield, WI | 466 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Ray, AL | 466 | 38 | 24.0% |
| Reyno, AR | 466 | 26 | 48.0% |
| Menlo, IA | 466 | 39 | 22.0% |
| Plymouth, IA | 466 | 15 | 70.0% |
| Parker, ID | 466 | 43 | 14.0% |
| Bayfield, WI | 466 | 35 | 30.0% |
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