| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 32°F | 3.4" |
| February | 23°F | 44°F | 33°F | 3.1" |
| March | 33°F | 57°F | 44°F | 4.6" |
| April | 43°F | 69°F | 56°F | 5.0" |
| May | 52°F | 77°F | 64°F | 4.0" |
| June | 61°F | 85°F | 73°F | 5.2" |
| July | 65°F | 87°F | 76°F | 4.0" |
| August | 64°F | 88°F | 76°F | 3.0" |
| September | 57°F | 81°F | 69°F | 4.1" |
| October | 45°F | 69°F | 57°F | 4.1" |
| November | 34°F | 57°F | 45°F | 3.5" |
| December | 27°F | 45°F | 36°F | 4.5" |
| Index | Delhi Hills | Ohio | National |
| Air quality index | 54 | 40 | 42 |
| Pollution index | 23,937,200 | 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 | 0.500% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.110% |
| Lead | 0.250% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Union, KY | 5,988 | 54 | 8.0% |
| Highland Heights, KY | 7,372 | 54 | 8.0% |
| Coldstream, OH | 1,383 | 54 | 8.0% |
| Hidden Valley, IN | 5,075 | 54 | 8.0% |
| Elizabethtown, OH | 284 | 54 | 8.0% |
| Delhi Hills, OH | 5,041 | 54 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Mattawa, WA | 5,040 | 38 | 24.0% |
| Gretna, NE | 5,039 | 40 | 20.0% |
| Rainsville, AL | 5,038 | 39 | 22.0% |
| Hudson, TX | 5,038 | 36 | 28.0% |
| Coverdale, NB | 5,038 | n/a | |
| Delhi Hills, OH | 5,041 | 54 | 8.0% |
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