| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 33°F | 27°F | 1.2" |
| February | 22°F | 34°F | 28°F | 1.3" |
| March | 30°F | 48°F | 38°F | 5.9" |
| April | 38°F | 58°F | 47°F | 5.4" |
| May | 52°F | 72°F | 61°F | 4.9" |
| June | 59°F | 80°F | 69°F | 6.0" |
| July | 65°F | 87°F | 76°F | 6.0" |
| August | 61°F | 82°F | 71°F | 7.8" |
| September | 52°F | 72°F | 61°F | 6.1" |
| October | 42°F | 63°F | 51°F | 3.5" |
| November | 33°F | 50°F | 41°F | 4.7" |
| December | 26°F | 36°F | 31°F | 2.5" |
| Index | Clarksville | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 1,401,450 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Vermontville, MI | 700 | 36 | 28.0% |
| Sunfield, MI | 676 | 36 | 28.0% |
| Woodland, MI | 530 | 36 | 28.0% |
| Caledonia, MI | 1,442 | 38 | 24.0% |
| Ionia, MI | 11,178 | 38 | 24.0% |
| Clarksville, MI | 371 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Farmersburg, IA | 371 | 29 | 42.0% |
| Kendrick, ID | 371 | 10 | 80.0% |
| New Point, IN | 371 | 41 | 18.0% |
| Monterey, LA | 371 | 30 | 40.0% |
| Bear Lake, MI | 371 | 36 | 28.0% |
| Clarksville, MI | 371 | 38 | 24.0% |
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