| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 39°F | 29°F | 2.9" |
| February | 20°F | 40°F | 30°F | 2.5" |
| March | 30°F | 53°F | 40°F | 3.3" |
| April | 40°F | 66°F | 53°F | 3.2" |
| May | 49°F | 75°F | 62°F | 4.1" |
| June | 59°F | 82°F | 70°F | 4.3" |
| July | 62°F | 85°F | 73°F | 4.5" |
| August | 61°F | 84°F | 72°F | 3.5" |
| September | 54°F | 78°F | 66°F | 3.0" |
| October | 44°F | 66°F | 54°F | 3.6" |
| November | 33°F | 55°F | 43°F | 2.6" |
| December | 26°F | 43°F | 34°F | 3.6" |
| Index | Wellsville | Ohio | National |
| Air quality index | 6 | 40 | 42 |
| Pollution index | 724,968 | 4,472,386 | 2,726,193 |
| Measurement | Total |
| Days measured | 354 |
| Days with good air quality | 353 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Calcutta, OH | 4,306 | 6 | 88.0% |
| Ohioville, PA | 3,313 | 6 | 88.0% |
| La Croft, OH | 1,048 | 6 | 88.0% |
| Chester, WV | 2,172 | 6 | 88.0% |
| Bergholz, OH | 636 | 6 | 88.0% |
| Wellsville, OH | 3,336 | 6 | 88.0% |
| City | Population | Air Quality Index | National Avg. |
| Oakridge, OR | 3,336 | 38 | 24.0% |
| Etna, PA | 3,336 | 56 | 12.0% |
| Saint-Ferréol-les-Neiges, QC | 3,336 | n/a | |
| Hatfield, PA | 3,337 | 51 | 2.0% |
| Port Ewen, NY | 3,334 | 36 | 28.0% |
| Wellsville, OH | 3,336 | 6 | 88.0% |
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