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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 38°F | 30°F | 2.9" |
| February | 23°F | 40°F | 30°F | 2.0" |
| March | 32°F | 52°F | 41°F | 3.5" |
| April | 42°F | 65°F | 53°F | 3.3" |
| May | 51°F | 73°F | 62°F | 4.2" |
| June | 59°F | 80°F | 69°F | 4.5" |
| July | 63°F | 84°F | 73°F | 3.6" |
| August | 62°F | 83°F | 72°F | 3.9" |
| September | 55°F | 77°F | 65°F | 3.3" |
| October | 45°F | 65°F | 54°F | 3.6" |
| November | 35°F | 54°F | 44°F | 2.6" |
| December | 27°F | 43°F | 34°F | 3.6" |
| Index | Avella | Pennsylvania | National |
| Air quality index | 46 | 45 | 42 |
| Pollution index | 1,410,280 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 217 |
| Days with moderate air quality | 144 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Martins Ferry, OH | 6,589 | 39 | 22.0% |
| Rayland, OH | 481 | 39 | 22.0% |
| Bridgeport, OH | 1,652 | 39 | 22.0% |
| Green Hills, PA | 14 | 39 | 22.0% |
| Yorkville, OH | 1,013 | 39 | 22.0% |
| Avella, PA | 920 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Sioux Rapids, IA | 920 | 35 | 30.0% |
| Gifford, IL | 920 | 42 | 16.0% |
| Greenview, IL | 920 | 40 | 20.0% |
| Flat Lick, KY | 920 | 39 | 22.0% |
| East Hampton, NY | 920 | 37 | 26.0% |
| Avella, PA | 920 | 46 | 8.0% |
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