| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 2.8" |
| February | 23°F | 40°F | 31°F | 2.5" |
| March | 34°F | 54°F | 43°F | 4.4" |
| April | 43°F | 66°F | 54°F | 4.7" |
| May | 53°F | 75°F | 64°F | 4.4" |
| June | 61°F | 83°F | 72°F | 5.8" |
| July | 65°F | 85°F | 74°F | 4.0" |
| August | 63°F | 84°F | 74°F | 2.6" |
| September | 56°F | 78°F | 67°F | 3.6" |
| October | 45°F | 67°F | 55°F | 3.7" |
| November | 34°F | 54°F | 44°F | 3.1" |
| December | 28°F | 43°F | 35°F | 4.0" |
| Index | Bellbrook | Ohio | National |
| Air quality index | 47 | 40 | 42 |
| Pollution index | 11,539,300 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 213 |
| Days with moderate air quality | 152 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Spring Valley, OH | 855 | 43 | 14.0% |
| New Burlington, OH | 4,526 | 43 | 14.0% |
| Lebanon, OH | 20,781 | 43 | 14.0% |
| Harveysburg, OH | 725 | 43 | 14.0% |
| Wilmington, OH | 12,444 | 43 | 14.0% |
| Bellbrook, OH | 7,277 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| La Feria, TX | 7,276 | 44 | 12.0% |
| Fort Bragg, CA | 7,279 | 33 | 34.0% |
| Dunlap, IN | 7,273 | 37 | 26.0% |
| Dade City, FL | 7,270 | 36 | 28.0% |
| Nebraska City, NE | 7,270 | 40 | 20.0% |
| Bellbrook, OH | 7,277 | 47 | 6.0% |
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