| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 40°F | 30°F | 3.5" |
| February | 20°F | 42°F | 31°F | 3.1" |
| March | 28°F | 53°F | 40°F | 3.4" |
| April | 38°F | 67°F | 52°F | 3.9" |
| May | 48°F | 76°F | 62°F | 3.7" |
| June | 58°F | 84°F | 71°F | 5.5" |
| July | 63°F | 88°F | 75°F | 6.4" |
| August | 61°F | 85°F | 73°F | 5.0" |
| September | 54°F | 80°F | 66°F | 4.5" |
| October | 43°F | 68°F | 55°F | 5.4" |
| November | 33°F | 56°F | 44°F | 2.8" |
| December | 26°F | 45°F | 35°F | 4.9" |
| Index | Northampton | Pennsylvania | National |
| Air quality index | 42 | 45 | 42 |
| Pollution index | 3,167,110 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 275 |
| Days with moderate air quality | 86 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Ackermanville, PA | 398 | 34 | 32.0% |
| Pen Argyl, PA | 3,551 | 34 | 32.0% |
| Roseto, PA | 2,198 | 34 | 32.0% |
| Wind Gap, PA | 2,728 | 34 | 32.0% |
| Bangor, PA | 5,229 | 34 | 32.0% |
| Northampton, PA | 9,869 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Jesup, GA | 9,864 | 36 | 28.0% |
| Jennings, LA | 9,874 | 45 | 10.0% |
| Fort Oglethorpe, GA | 9,877 | 46 | 8.0% |
| Stonegate, CO | 9,860 | 58 | 16.0% |
| Kendall Park, NJ | 9,852 | 41 | 18.0% |
| Northampton, PA | 9,869 | 42 | 16.0% |
Here are the best places to live in Pennsylvania
These are the 10 cheapest cities in Pennsylvania
See the best places to live in Northampton
Most Dangerous Cities In The US