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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 41°F | 33°F | 3.2" |
| February | 26°F | 42°F | 33°F | 2.5" |
| March | 34°F | 53°F | 42°F | 6.9" |
| April | 43°F | 65°F | 53°F | 3.6" |
| May | 52°F | 74°F | 63°F | 6.0" |
| June | 61°F | 81°F | 71°F | 6.5" |
| July | 66°F | 86°F | 76°F | 7.9" |
| August | 63°F | 83°F | 73°F | 11.0" |
| September | 56°F | 77°F | 66°F | 6.8" |
| October | 46°F | 66°F | 55°F | 9.4" |
| November | 37°F | 55°F | 45°F | 2.9" |
| December | 31°F | 46°F | 38°F | 7.7" |
| Index | Narberth | 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. |
| Trevose, PA | 3,460 | 41 | 18.0% |
| Churchville, PA | 5,323 | 41 | 18.0% |
| Royersford, PA | 4,760 | 42 | 16.0% |
| Greenfields, PA | 1,130 | 42 | 16.0% |
| Spring City, PA | 3,307 | 42 | 16.0% |
| Narberth, PA | 4,304 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Mather, CA | 4,304 | 52 | 4.0% |
| Madeira Beach, FL | 4,303 | 43 | 14.0% |
| Grayson, GA | 4,303 | 52 | 4.0% |
| Sparta, IL | 4,302 | 54 | 8.0% |
| Golden Triangle, NJ | 4,302 | 51 | 2.0% |
| Narberth, PA | 4,304 | 51 | 2.0% |
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