| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 30°F | 24°F | 1.6" |
| February | 16°F | 31°F | 24°F | 0.9" |
| March | 23°F | 42°F | 32°F | 1.7" |
| April | 33°F | 56°F | 44°F | 3.0" |
| May | 44°F | 69°F | 55°F | 2.8" |
| June | 54°F | 78°F | 66°F | 3.2" |
| July | 59°F | 83°F | 71°F | 2.3" |
| August | 59°F | 81°F | 69°F | 3.4" |
| September | 52°F | 74°F | 62°F | 3.4" |
| October | 42°F | 60°F | 51°F | 4.0" |
| November | 32°F | 48°F | 39°F | 2.5" |
| December | 23°F | 34°F | 29°F | 1.8" |
| Index | Grawn | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 1,468,630 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 247 |
| Days with good air quality | 232 |
| Days with moderate air quality | 15 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Kingsley, MI | 1,933 | 36 | 28.0% |
| Chums Corner, MI | 1,117 | 36 | 28.0% |
| Lake Ann, MI | 220 | 36 | 28.0% |
| Thompsonville, MI | 440 | 36 | 28.0% |
| Cedar, MI | 95 | 36 | 28.0% |
| Grawn, MI | 933 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Mi-Wuk Village, CA | 933 | 39 | 22.0% |
| Woods Hole, MA | 933 | 36 | 28.0% |
| Charlestown, NH | 933 | 34 | 32.0% |
| Salem, NY | 933 | 35 | 30.0% |
| Brady Lake, OH | 933 | 43 | 14.0% |
| Grawn, MI | 933 | 36 | 28.0% |
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