| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 25°F | 19°F | 0.8" |
| February | 10°F | 25°F | 18°F | 0.8" |
| March | 19°F | 36°F | 27°F | 1.9" |
| April | 30°F | 49°F | 39°F | 2.9" |
| May | 41°F | 64°F | 51°F | 4.1" |
| June | 50°F | 72°F | 60°F | 5.9" |
| July | 55°F | 77°F | 65°F | 4.6" |
| August | 55°F | 75°F | 64°F | 4.5" |
| September | 48°F | 68°F | 57°F | 5.5" |
| October | 38°F | 54°F | 46°F | 5.4" |
| November | 29°F | 42°F | 35°F | 4.9" |
| December | 17°F | 29°F | 23°F | 3.6" |
| Index | St. James | Michigan | National |
| Air quality index | 32 | 69 | 42 |
| Pollution index | 2,083,760 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 58 |
| Days with good air quality | 53 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.003% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| St. James, MI | 211 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Langston, AL | 211 | 39 | 22.0% |
| Fiddletown, CA | 211 | 52 | 4.0% |
| Mesa Vista, CA | 211 | 13 | 74.0% |
| Samoa, CA | 211 | 27 | 46.0% |
| Rippey, IA | 211 | 37 | 26.0% |
| St. James, MI | 211 | 32 | 36.0% |
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