| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 4.7" |
| February | 22°F | 40°F | 30°F | 4.9" |
| March | 33°F | 54°F | 42°F | 6.6" |
| April | 42°F | 67°F | 54°F | 6.8" |
| May | 52°F | 75°F | 64°F | 6.8" |
| June | 61°F | 83°F | 72°F | 7.3" |
| July | 64°F | 85°F | 75°F | 8.6" |
| August | 63°F | 85°F | 74°F | 6.8" |
| September | 56°F | 79°F | 66°F | 6.6" |
| October | 44°F | 67°F | 55°F | 6.5" |
| November | 33°F | 55°F | 43°F | 6.1" |
| December | 27°F | 43°F | 34°F | 6.1" |
| Index | New Carlisle | Ohio | National |
| Air quality index | 45 | 40 | 42 |
| Pollution index | 11,539,300 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 220 |
| Days with moderate air quality | 143 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.210% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.110% |
| Mercury | 0.050% |
| City | Population | Air Quality Index | National Avg. |
| Donnelsville, OH | 329 | 45 | 10.0% |
| Enon, OH | 2,517 | 45 | 10.0% |
| Tremont City, OH | 307 | 45 | 10.0% |
| Cedarville, OH | 3,848 | 45 | 10.0% |
| St. Paris, OH | 2,126 | 45 | 10.0% |
| New Carlisle, OH | 5,577 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Okeechobee, FL | 5,574 | 36 | 28.0% |
| Cresaptown, MD | 5,584 | 36 | 28.0% |
| Forest, MS | 5,569 | 44 | 12.0% |
| Willow Park, TX | 5,585 | 33 | 34.0% |
| Rutherford, PA | 5,568 | 44 | 12.0% |
| New Carlisle, OH | 5,577 | 45 | 10.0% |
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