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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 16°F | 33°F | 24°F | 2.6" |
| February | 16°F | 34°F | 25°F | 1.7" |
| March | 25°F | 47°F | 35°F | 2.4" |
| April | 35°F | 62°F | 48°F | 3.5" |
| May | 46°F | 72°F | 59°F | 3.9" |
| June | 56°F | 81°F | 69°F | 4.5" |
| July | 60°F | 85°F | 72°F | 3.5" |
| August | 58°F | 83°F | 70°F | 4.4" |
| September | 51°F | 76°F | 63°F | 3.0" |
| October | 41°F | 63°F | 51°F | 3.7" |
| November | 31°F | 50°F | 40°F | 2.6" |
| December | 22°F | 37°F | 29°F | 2.3" |
| Index | St. Johns | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 1,401,450 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 330 |
| Days with moderate air quality | 35 |
| 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. |
| Ashley, MI | 505 | 36 | 28.0% |
| Maple Rapids, MI | 685 | 36 | 28.0% |
| Bath, MI | 3,110 | 36 | 28.0% |
| Laingsburg, MI | 1,586 | 36 | 28.0% |
| Carson City, MI | 1,038 | 36 | 28.0% |
| St. Johns, MI | 7,920 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| West Dundee, IL | 7,923 | 55 | 10.0% |
| Wytheville, VA | 7,925 | 41 | 18.0% |
| Camp Hill, PA | 7,926 | 44 | 12.0% |
| Bellevue, OH | 7,928 | 40 | 20.0% |
| West Long Branch, NJ | 7,911 | 51 | 2.0% |
| St. Johns, MI | 7,920 | 36 | 28.0% |
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