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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 3.3" |
| February | 25°F | 43°F | 34°F | 2.4" |
| March | 33°F | 53°F | 42°F | 3.4" |
| April | 43°F | 66°F | 54°F | 3.8" |
| May | 52°F | 75°F | 63°F | 3.9" |
| June | 62°F | 83°F | 72°F | 5.3" |
| July | 67°F | 88°F | 77°F | 5.1" |
| August | 65°F | 85°F | 75°F | 4.7" |
| September | 59°F | 79°F | 68°F | 3.5" |
| October | 48°F | 68°F | 57°F | 4.2" |
| November | 37°F | 57°F | 46°F | 2.9" |
| December | 31°F | 47°F | 38°F | 4.3" |
| Index | Morrisville CDP | Pennsylvania | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 3,313,920 | 4,584,805 | 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 | 0.350% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.350% |
| Mercury | 0.340% |
| City | Population | Air Quality Index | National Avg. |
| Dayton, NJ | 8,158 | 41 | 18.0% |
| Kendall Park, NJ | 9,852 | 41 | 18.0% |
| Princeton, NJ | 31,161 | 41 | 18.0% |
| New Hope, PA | 2,518 | 41 | 18.0% |
| Fieldsboro, NJ | 761 | 41 | 18.0% |
| Morrisville CDP, PA | 862 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Mosses, AL | 862 | 52 | 4.0% |
| Hermitage, AR | 862 | 35 | 30.0% |
| Jupiter Island, FL | 862 | 36 | 28.0% |
| Alexis, IL | 862 | 46 | 8.0% |
| Sanford, MI | 862 | 26 | 48.0% |
| Morrisville CDP, PA | 862 | 41 | 18.0% |
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