| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 40°F | 30°F | 3.2" |
| February | 22°F | 41°F | 31°F | 2.6" |
| March | 32°F | 54°F | 42°F | 4.4" |
| April | 42°F | 68°F | 55°F | 3.8" |
| May | 52°F | 76°F | 64°F | 3.6" |
| June | 61°F | 85°F | 73°F | 4.8" |
| July | 65°F | 87°F | 76°F | 4.8" |
| August | 64°F | 86°F | 75°F | 3.7" |
| September | 57°F | 80°F | 68°F | 3.6" |
| October | 45°F | 68°F | 56°F | 3.9" |
| November | 34°F | 56°F | 44°F | 2.7" |
| December | 27°F | 44°F | 35°F | 3.9" |
| Index | Etna | Ohio | National |
| Air quality index | 46 | 40 | 42 |
| Pollution index | 21,574,800 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.230% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.190% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Granville, OH | 5,829 | 41 | 18.0% |
| St. Louisville, OH | 413 | 41 | 18.0% |
| Granville South, OH | 1,243 | 41 | 18.0% |
| Heath, OH | 10,847 | 41 | 18.0% |
| Newark, OH | 49,951 | 41 | 18.0% |
| Etna, OH | 679 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Bowersville, GA | 679 | 41 | 18.0% |
| Attica, KS | 679 | 40 | 20.0% |
| Cherokee, KS | 679 | 37 | 26.0% |
| Kiowa, OK | 679 | 43 | 14.0% |
| Minor Hill, TN | 679 | 27 | 46.0% |
| Etna, OH | 679 | 46 | 8.0% |
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