| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 43°F | 34°F | 5.5" |
| February | 24°F | 39°F | 31°F | 3.2" |
| March | 31°F | 51°F | 40°F | 6.6" |
| April | 42°F | 62°F | 51°F | 10.1" |
| May | 50°F | 72°F | 60°F | 3.5" |
| June | 63°F | 82°F | 71°F | 10.0" |
| July | 67°F | 86°F | 75°F | 7.7" |
| August | 67°F | 86°F | 75°F | 7.3" |
| September | 59°F | 81°F | 69°F | 4.3" |
| October | 52°F | 69°F | 60°F | 14.4" |
| November | 38°F | 57°F | 46°F | 7.3" |
| December | 28°F | 43°F | 35°F | 5.6" |
| Index | Allentown | New Jersey | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 3,756,270 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 83 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.100% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Dayton, NJ | 8,158 | 41 | 18.0% |
| Monmouth Junction, NJ | 8,911 | 41 | 18.0% |
| Fieldsboro, NJ | 761 | 41 | 18.0% |
| New Egypt, NJ | 2,187 | 41 | 18.0% |
| Levittown, PA | 49,921 | 41 | 18.0% |
| Allentown, NJ | 1,740 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Blackwater, AZ | 1,740 | 74 | 48.0% |
| Boronda, CA | 1,740 | 37 | 26.0% |
| Fern Acres, HI | 1,740 | 16 | 68.0% |
| Wilder, ID | 1,740 | 36 | 28.0% |
| Charlotte Hall, MD | 1,740 | 47 | 6.0% |
| Allentown, NJ | 1,740 | 41 | 18.0% |
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