| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 32°F | 25°F | 3.7" |
| February | 17°F | 33°F | 25°F | 3.3" |
| March | 28°F | 47°F | 36°F | 4.8" |
| April | 38°F | 60°F | 48°F | 4.4" |
| May | 49°F | 71°F | 60°F | 6.1" |
| June | 58°F | 79°F | 68°F | 1.9" |
| July | 62°F | 82°F | 72°F | 6.8" |
| August | 60°F | 80°F | 69°F | 9.4" |
| September | 53°F | 74°F | 63°F | 5.5" |
| October | 42°F | 62°F | 51°F | 8.0" |
| November | 32°F | 49°F | 40°F | 4.3" |
| December | 24°F | 36°F | 30°F | 2.3" |
| Index | Reading | Michigan | National |
| Air quality index | 39 | 69 | 42 |
| Pollution index | 1,824,600 | 4,161,606 | 2,726,193 |
| Measurement | Total |
| Days measured | 358 |
| Days with good air quality | 286 |
| Days with moderate air quality | 72 |
| 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 | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Coldwater, MI | 12,203 | 38 | 24.0% |
| Quincy, MI | 1,422 | 38 | 24.0% |
| Litchfield, MI | 1,232 | 39 | 22.0% |
| North Adams, MI | 540 | 39 | 22.0% |
| Lake Seneca, OH | 656 | 39 | 22.0% |
| Reading, MI | 961 | 39 | 22.0% |
| City | Population | Air Quality Index | National Avg. |
| Tilden, IL | 961 | 43 | 14.0% |
| Funkstown, MD | 961 | 40 | 20.0% |
| Sheffield, PA | 961 | 9 | 82.0% |
| Browns Point, WA | 961 | 18 | 64.0% |
| Cashton, WI | 961 | 35 | 30.0% |
| Reading, MI | 961 | 39 | 22.0% |
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