| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 32°F | 25°F | 5.8" |
| February | 18°F | 33°F | 25°F | 2.4" |
| March | 28°F | 45°F | 36°F | 5.0" |
| April | 38°F | 59°F | 48°F | 6.1" |
| May | 49°F | 70°F | 59°F | 5.6" |
| June | 58°F | 79°F | 68°F | 3.4" |
| July | 62°F | 82°F | 72°F | 6.3" |
| August | 60°F | 80°F | 70°F | 2.1" |
| September | 53°F | 73°F | 62°F | 1.6" |
| October | 43°F | 61°F | 51°F | 7.7" |
| November | 33°F | 48°F | 40°F | 4.6" |
| December | 24°F | 36°F | 30°F | 0.7" |
| Index | Williamston | 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. |
| Fowlerville, MI | 2,888 | 36 | 28.0% |
| Webberville, MI | 1,238 | 36 | 28.0% |
| Morrice, MI | 1,453 | 36 | 28.0% |
| Dansville, MI | 609 | 36 | 28.0% |
| Haslett, MI | 19,223 | 36 | 28.0% |
| Williamston, MI | 3,939 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Baxter Springs, KS | 3,938 | 38 | 24.0% |
| Prince Albert No. 461, SK | 3,940 | n/a | |
| Panther Valley, NJ | 3,937 | 34 | 32.0% |
| Basalt, CO | 3,941 | 44 | 12.0% |
| Waverly, NE | 3,941 | 31 | 38.0% |
| Williamston, MI | 3,939 | 36 | 28.0% |
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