| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 4.1" |
| February | 19°F | 39°F | 29°F | 3.3" |
| March | 27°F | 51°F | 38°F | 7.5" |
| April | 39°F | 62°F | 50°F | 7.2" |
| May | 46°F | 73°F | 60°F | 3.6" |
| June | 60°F | 84°F | 72°F | 4.8" |
| July | 62°F | 86°F | 74°F | 7.7" |
| August | 63°F | 86°F | 74°F | 8.7" |
| September | 54°F | 81°F | 67°F | 0.4" |
| October | 47°F | 71°F | 58°F | 10.0" |
| November | 33°F | 57°F | 45°F | 4.7" |
| December | 23°F | 41°F | 33°F | 4.8" |
| Index | New Salem CDP | Pennsylvania | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 12,532,500 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 299 |
| Days with moderate air quality | 66 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.180% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.130% |
| Mercury | 0.270% |
| City | Population | Air Quality Index | National Avg. |
| Seven Valleys, PA | 626 | 41 | 18.0% |
| Dallastown, PA | 3,889 | 41 | 18.0% |
| Jacobus, PA | 2,510 | 41 | 18.0% |
| Spry, PA | 4,914 | 41 | 18.0% |
| West York, PA | 4,636 | 41 | 18.0% |
| New Salem CDP, PA | 446 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Hamilton Branch, CA | 446 | 46 | 8.0% |
| Humboldt, IL | 446 | 42 | 16.0% |
| Utica, KY | 446 | 43 | 14.0% |
| Edgefield, LA | 446 | 39 | 22.0% |
| Georgetown, LA | 446 | 30 | 40.0% |
| New Salem CDP, PA | 446 | 41 | 18.0% |
Here are the best places to live in Pennsylvania
See the best places to live in New Salem CDP
Most Dangerous States In The US
Most Dangerous Cities In The US