| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 42°F | 32°F | 2.7" |
| February | 24°F | 44°F | 34°F | 2.6" |
| March | 34°F | 57°F | 44°F | 4.1" |
| April | 43°F | 69°F | 56°F | 4.9" |
| May | 52°F | 77°F | 64°F | 3.9" |
| June | 61°F | 85°F | 73°F | 4.5" |
| July | 65°F | 87°F | 75°F | 4.7" |
| August | 63°F | 87°F | 75°F | 2.7" |
| September | 56°F | 81°F | 67°F | 3.3" |
| October | 45°F | 69°F | 56°F | 3.6" |
| November | 33°F | 57°F | 44°F | 2.9" |
| December | 28°F | 46°F | 36°F | 3.7" |
| Index | Hamersville | Ohio | National |
| Air quality index | 54 | 40 | 42 |
| Pollution index | 746,363 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 139 |
| Days with moderate air quality | 206 |
| Days w/ poor A.Q. for sensitive groups | 20 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.060% |
| Lead | 0.020% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lake Waynoka, OH | 972 | 43 | 14.0% |
| Mount Orab, OH | 4,403 | 43 | 14.0% |
| Sardinia, OH | 1,333 | 43 | 14.0% |
| Mowrystown, OH | 418 | 43 | 14.0% |
| Russellville, OH | 716 | 43 | 14.0% |
| Hamersville, OH | 739 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Parkin, AR | 739 | 45 | 10.0% |
| Maxwell, IA | 739 | 37 | 26.0% |
| Greenbush, MN | 739 | 33 | 34.0% |
| East Bend, NC | 739 | 45 | 10.0% |
| San Perlita, TX | 739 | 44 | 12.0% |
| Hamersville, OH | 739 | 54 | 8.0% |
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