| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 28°F | 3.4" |
| February | 20°F | 40°F | 30°F | 2.3" |
| March | 31°F | 53°F | 41°F | 4.0" |
| April | 41°F | 67°F | 53°F | 4.5" |
| May | 51°F | 75°F | 63°F | 4.1" |
| June | 61°F | 84°F | 72°F | 4.5" |
| July | 63°F | 85°F | 74°F | 4.3" |
| August | 62°F | 85°F | 73°F | 2.9" |
| September | 55°F | 79°F | 67°F | 4.3" |
| October | 44°F | 67°F | 55°F | 3.5" |
| November | 33°F | 55°F | 43°F | 3.1" |
| December | 25°F | 42°F | 33°F | 3.9" |
| Index | Arcanum | Ohio | National |
| Air quality index | 6 | 40 | 42 |
| Pollution index | 1,369,080 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 364 |
| Days with moderate air quality | |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Eldorado, OH | 598 | 6 | 88.0% |
| Palestine, OH | 252 | 6 | 88.0% |
| Hollansburg, OH | 273 | 6 | 88.0% |
| Greenville, OH | 12,743 | 6 | 88.0% |
| Whitewater, IN | 40 | 6 | 88.0% |
| Arcanum, OH | 2,457 | 6 | 88.0% |
| City | Population | Air Quality Index | National Avg. |
| Henagar, AL | 2,457 | 39 | 22.0% |
| New Palestine, IN | 2,456 | 54 | 8.0% |
| McConnelsville, OH | 2,456 | 25 | 50.0% |
| Kinsey, AL | 2,458 | 35 | 30.0% |
| Canton, MO | 2,455 | 41 | 18.0% |
| Arcanum, OH | 2,457 | 6 | 88.0% |
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