| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 34°F | 26°F | 2.8" |
| February | 20°F | 36°F | 27°F | 2.4" |
| March | 31°F | 52°F | 40°F | 4.8" |
| April | 40°F | 63°F | 50°F | 3.3" |
| May | 49°F | 74°F | 60°F | 4.6" |
| June | 57°F | 81°F | 68°F | 5.5" |
| July | 61°F | 85°F | 72°F | 6.5" |
| August | 59°F | 83°F | 70°F | 4.0" |
| September | 53°F | 76°F | 63°F | 3.8" |
| October | 43°F | 63°F | 52°F | 3.5" |
| November | 33°F | 53°F | 42°F | 3.6" |
| December | 25°F | 40°F | 31°F | 3.3" |
| Index | Ellwood City | Pennsylvania | National |
| Air quality index | 31 | 45 | 42 |
| Pollution index | 601,986 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 361 |
| Days with good air quality | 356 |
| Days with moderate air quality | 5 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Freedom, PA | 1,677 | 6 | 88.0% |
| Bridgewater, PA | 865 | 6 | 88.0% |
| Patterson Heights, PA | 570 | 6 | 88.0% |
| Glasgow, PA | 115 | 6 | 88.0% |
| Calcutta, OH | 4,306 | 6 | 88.0% |
| Ellwood City, PA | 7,436 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Georgetown, DE | 7,436 | 36 | 28.0% |
| Scappoose, OR | 7,436 | 38 | 24.0% |
| Whitinsville, MA | 7,435 | 40 | 20.0% |
| Clarkston, WA | 7,435 | 29 | 42.0% |
| Montpelier, VT | 7,434 | 37 | 26.0% |
| Ellwood City, PA | 7,436 | 31 | 38.0% |
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