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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 42°F | 33°F | 3.6" |
| February | 26°F | 46°F | 35°F | 3.0" |
| March | 33°F | 54°F | 43°F | 3.9" |
| April | 43°F | 67°F | 55°F | 3.8" |
| May | 54°F | 76°F | 64°F | 4.6" |
| June | 62°F | 84°F | 73°F | 6.6" |
| July | 69°F | 89°F | 79°F | 5.2" |
| August | 65°F | 85°F | 75°F | 4.6" |
| September | 60°F | 81°F | 70°F | 3.7" |
| October | 48°F | 69°F | 58°F | 4.7" |
| November | 36°F | 58°F | 47°F | 2.6" |
| December | 31°F | 49°F | 40°F | 4.0" |
| Index | Newport | Delaware | National |
| Air quality index | 51 | 41 | 42 |
| Pollution index | 2,169,600 | 7,274,307 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 180 |
| Days with moderate air quality | 169 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Pennsville, NJ | 11,968 | 40 | 20.0% |
| Quinton, NJ | 369 | 40 | 20.0% |
| Woodstown, NJ | 3,445 | 40 | 20.0% |
| Salem, NJ | 4,761 | 40 | 20.0% |
| Alloway, NJ | 1,474 | 40 | 20.0% |
| Newport, DE | 906 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| North Edwards, CA | 906 | 67 | 34.0% |
| Elizabeth, IL | 906 | 29 | 42.0% |
| East Gull Lake, MN | 906 | 29 | 42.0% |
| Hallock, MN | 906 | 33 | 34.0% |
| Silver Lake, MN | 906 | 32 | 36.0% |
| Newport, DE | 906 | 51 | 2.0% |
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