| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 15°F | 30°F | 23°F | 3.5" |
| February | 13°F | 31°F | 22°F | 2.7" |
| March | 23°F | 44°F | 33°F | 3.6" |
| April | 33°F | 57°F | 45°F | 6.2" |
| May | 44°F | 69°F | 57°F | 6.7" |
| June | 53°F | 77°F | 65°F | 5.9" |
| July | 57°F | 81°F | 69°F | 6.2" |
| August | 56°F | 79°F | 67°F | 5.1" |
| September | 49°F | 72°F | 60°F | 4.9" |
| October | 39°F | 59°F | 48°F | 4.9" |
| November | 30°F | 47°F | 38°F | 4.5" |
| December | 21°F | 34°F | 28°F | 2.3" |
| Index | Pierson | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 1,927,350 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 298 |
| Days with moderate air quality | 67 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Morley, MI | 578 | 38 | 24.0% |
| Kent City, MI | 1,173 | 38 | 24.0% |
| Casnovia, MI | 280 | 38 | 24.0% |
| Rockford, MI | 6,310 | 38 | 24.0% |
| Howard City, MI | 1,799 | 38 | 24.0% |
| Pierson, MI | 140 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Klagetoh, AZ | 140 | 17 | 66.0% |
| Sorrento, FL | 140 | 37 | 26.0% |
| Mendes, GA | 140 | 39 | 22.0% |
| Bernard, IA | 140 | 29 | 42.0% |
| Brunsville, IA | 140 | 35 | 30.0% |
| Pierson, MI | 140 | 38 | 24.0% |
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