| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 17°F | 33°F | 25°F | 2.2" |
| February | 17°F | 34°F | 25°F | 1.8" |
| March | 27°F | 47°F | 36°F | 2.2" |
| April | 37°F | 61°F | 48°F | 3.3" |
| May | 47°F | 72°F | 59°F | 3.8" |
| June | 57°F | 80°F | 69°F | 4.0" |
| July | 60°F | 83°F | 72°F | 3.7" |
| August | 59°F | 81°F | 70°F | 4.2" |
| September | 52°F | 75°F | 63°F | 3.0" |
| October | 42°F | 63°F | 52°F | 3.1" |
| November | 32°F | 50°F | 40°F | 2.3" |
| December | 23°F | 37°F | 30°F | 2.0" |
| Index | Leslie | Michigan | National |
| Air quality index | 36 | 69 | 42 |
| Pollution index | 8,357,230 | 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 | 0.070% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.090% |
| Mercury | 0.120% |
| City | Population | Air Quality Index | National Avg. |
| Eaton Rapids, MI | 5,371 | 36 | 28.0% |
| Mason, MI | 8,624 | 36 | 28.0% |
| Dimondale, MI | 1,647 | 36 | 28.0% |
| Webberville, MI | 1,279 | 36 | 28.0% |
| Holt, MI | 26,494 | 36 | 28.0% |
| Leslie, MI | 2,258 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Commercial Point, OH | 2,258 | 46 | 8.0% |
| Roseville, OH | 2,258 | 25 | 50.0% |
| Holley, FL | 2,257 | 41 | 18.0% |
| Saint-Roch-de-Richelieu, QC | 2,257 | n/a | |
| Aviston, IL | 2,259 | 54 | 8.0% |
| Leslie, MI | 2,258 | 36 | 28.0% |