| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 4°F | 23°F | 14°F | 0.6" |
| February | 5°F | 27°F | 16°F | 0.5" |
| March | 19°F | 43°F | 30°F | 1.5" |
| April | 31°F | 56°F | 43°F | 2.6" |
| May | 42°F | 69°F | 55°F | 3.9" |
| June | 52°F | 77°F | 64°F | 4.5" |
| July | 56°F | 82°F | 69°F | 4.2" |
| August | 54°F | 79°F | 66°F | 4.9" |
| September | 47°F | 71°F | 58°F | 4.0" |
| October | 36°F | 57°F | 46°F | 3.3" |
| November | 24°F | 42°F | 33°F | 1.1" |
| December | 10°F | 27°F | 19°F | 1.2" |
| Index | Hayward | Wisconsin | National |
| Air quality index | 35 | 69 | 42 |
| Pollution index | 2,555,860 | 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 | 0.003% |
| 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% |
| Springbrook, WI | 40 | 35 | 30.0% |
| Little Round Lake, WI | 1,230 | 35 | 30.0% |
| Reserve, WI | 393 | 35 | 30.0% |
| Hayward, WI | 2,466 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Bentleyville, PA | 2,466 | 56 | 12.0% |
| Portage, PA | 2,466 | 39 | 22.0% |
| Fredonia, WI | 2,466 | 38 | 24.0% |
| Saint-Victor, QC | 2,466 | n/a | |
| Lincoln, AR | 2,465 | 44 | 12.0% |
| Hayward, WI | 2,466 | 35 | 30.0% |
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