| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 2.5" |
| February | 17°F | 34°F | 26°F | 2.0" |
| March | 25°F | 47°F | 36°F | 2.5" |
| April | 36°F | 62°F | 48°F | 4.5" |
| May | 47°F | 73°F | 60°F | 3.3" |
| June | 57°F | 82°F | 70°F | 4.8" |
| July | 61°F | 85°F | 73°F | 4.3" |
| August | 60°F | 83°F | 71°F | 3.8" |
| September | 52°F | 77°F | 64°F | 3.2" |
| October | 42°F | 64°F | 52°F | 4.9" |
| November | 32°F | 51°F | 41°F | 2.7" |
| December | 24°F | 38°F | 30°F | 2.5" |
| Index | Wayland | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,797,130 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 241 |
| Days with good air quality | 185 |
| Days with moderate air quality | 51 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Delton, MI | 596 | 38 | 24.0% |
| Byron Center, MI | 6,653 | 38 | 24.0% |
| Middleville, MI | 3,447 | 38 | 24.0% |
| Cutlerville, MI | 17,988 | 38 | 24.0% |
| Caledonia, MI | 1,442 | 38 | 24.0% |
| Wayland, MI | 4,227 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Bristow, OK | 4,226 | 45 | 10.0% |
| Bellville, TX | 4,228 | 52 | 4.0% |
| China Grove, NC | 4,225 | 40 | 20.0% |
| Kewaskum, WI | 4,224 | 36 | 28.0% |
| Orangetree, FL | 4,231 | 34 | 32.0% |
| Wayland, MI | 4,227 | 39 | 22.0% |
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