| 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 | Byron | Michigan | National |
| Air quality index | 38 | 69 | 42 |
| Pollution index | 449,908 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 340 |
| Days with good air quality | 282 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Morrice, MI | 1,453 | 36 | 28.0% |
| Fowlerville, MI | 2,888 | 36 | 28.0% |
| Perry, MI | 2,248 | 36 | 28.0% |
| Webberville, MI | 1,238 | 36 | 28.0% |
| Lennon, MI | 431 | 38 | 24.0% |
| Byron, MI | 568 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Dustin Acres, CA | 568 | 67 | 34.0% |
| Hopkinton, IA | 568 | 39 | 22.0% |
| Scranton, IA | 568 | 37 | 26.0% |
| Firth, ID | 568 | 27 | 46.0% |
| Hutsonville, IL | 568 | 45 | 10.0% |
| Byron, MI | 568 | 38 | 24.0% |
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