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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 44°F | 34°F | 3.3" |
| February | 26°F | 46°F | 35°F | 2.6" |
| March | 33°F | 56°F | 44°F | 3.6" |
| April | 44°F | 68°F | 56°F | 4.0" |
| May | 54°F | 77°F | 65°F | 3.9" |
| June | 64°F | 86°F | 74°F | 4.8" |
| July | 70°F | 90°F | 79°F | 5.0" |
| August | 68°F | 87°F | 77°F | 5.8" |
| September | 61°F | 82°F | 71°F | 4.3" |
| October | 50°F | 70°F | 59°F | 4.7" |
| November | 39°F | 59°F | 48°F | 2.8" |
| December | 31°F | 49°F | 40°F | 4.7" |
| Index | Lansdowne | Pennsylvania | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 12,485,100 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 180 |
| Days with moderate air quality | 169 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.100% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.120% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Morton, PA | 2,671 | 51 | 2.0% |
| Ridley Park, PA | 7,042 | 51 | 2.0% |
| Woodlyn, PA | 9,732 | 51 | 2.0% |
| Glenside, PA | 7,237 | 51 | 2.0% |
| Wyncote, PA | 3,333 | 51 | 2.0% |
| Lansdowne, PA | 10,637 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Roscoe, IL | 10,632 | 42 | 16.0% |
| East Liverpool, OH | 10,632 | 6 | 88.0% |
| Timonium, MD | 10,642 | 46 | 8.0% |
| Corning, NY | 10,642 | 35 | 30.0% |
| Gardere, LA | 10,629 | 45 | 10.0% |
| Lansdowne, PA | 10,637 | 51 | 2.0% |
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