| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 5.8" |
| February | 25°F | 44°F | 34°F | 4.0" |
| March | 32°F | 54°F | 42°F | 6.4" |
| April | 42°F | 66°F | 53°F | 5.8" |
| May | 52°F | 75°F | 63°F | 7.4" |
| June | 61°F | 83°F | 71°F | 6.9" |
| July | 66°F | 88°F | 76°F | 8.6" |
| August | 64°F | 85°F | 74°F | 8.3" |
| September | 58°F | 79°F | 67°F | 7.4" |
| October | 47°F | 68°F | 57°F | 7.7" |
| November | 37°F | 57°F | 46°F | 5.4" |
| December | 30°F | 48°F | 39°F | 7.4" |
| Index | Juliustown | New Jersey | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 10,942,500 | 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 | 0.010% |
| Benzene | 0.110% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.020% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Fieldsboro, NJ | 761 | 41 | 18.0% |
| New Egypt, NJ | 2,187 | 41 | 18.0% |
| Croydon, PA | 9,693 | 41 | 18.0% |
| Penndel, PA | 2,928 | 41 | 18.0% |
| Country Lake Estates, NJ | 4,257 | 41 | 18.0% |
| Juliustown, NJ | 275 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Ambler, AK | 275 | 38 | 24.0% |
| Huslia, AK | 275 | 38 | 24.0% |
| Mount Olive CDP (Coosa County), AL | 275 | 53 | 6.0% |
| Oconee, GA | 275 | 38 | 24.0% |
| Kimballton, IA | 275 | 40 | 20.0% |
| Juliustown, NJ | 275 | 41 | 18.0% |
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