| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 33°F | 25°F | 2.4" |
| February | 15°F | 35°F | 25°F | 1.8" |
| March | 25°F | 47°F | 35°F | 2.3" |
| April | 35°F | 62°F | 48°F | 3.3" |
| May | 46°F | 73°F | 60°F | 4.9" |
| June | 56°F | 82°F | 69°F | 3.4" |
| July | 59°F | 85°F | 73°F | 3.8" |
| August | 58°F | 83°F | 71°F | 3.5" |
| September | 51°F | 77°F | 63°F | 3.4" |
| October | 41°F | 64°F | 52°F | 2.9" |
| November | 30°F | 51°F | 40°F | 2.2" |
| December | 22°F | 37°F | 30°F | 2.0" |
| Index | Henderson | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 1,401,450 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 282 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| St. Charles, MI | 2,101 | 26 | 48.0% |
| Elsie, MI | 1,066 | 36 | 28.0% |
| Laingsburg, MI | 1,586 | 36 | 28.0% |
| Ashley, MI | 505 | 36 | 28.0% |
| Ovid, MI | 1,559 | 36 | 28.0% |
| Henderson, MI | 350 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Traskwood, AR | 350 | 38 | 24.0% |
| Bode, IA | 350 | 15 | 70.0% |
| Kilbourne, IL | 350 | 40 | 20.0% |
| Steward, IL | 350 | 42 | 16.0% |
| Bremen, KY | 350 | 43 | 14.0% |
| Henderson, MI | 350 | 38 | 24.0% |
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