| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 48°F | 39°F | 7.2" |
| February | 25°F | 43°F | 34°F | 3.7" |
| March | 33°F | 54°F | 43°F | 7.2" |
| April | 42°F | 65°F | 53°F | 4.6" |
| May | 49°F | 73°F | 61°F | 7.3" |
| June | 63°F | 83°F | 72°F | 5.0" |
| July | 68°F | 87°F | 77°F | 8.6" |
| August | 68°F | 87°F | 77°F | 5.2" |
| September | 59°F | 84°F | 71°F | 1.4" |
| October | 53°F | 73°F | 62°F | 9.9" |
| November | 39°F | 61°F | 50°F | 4.3" |
| December | 30°F | 48°F | 39°F | 5.2" |
| Index | Bridgeville | Delaware | National |
| Air quality index | 36 | 41 | 42 |
| Pollution index | 1,358,370 | 7,274,307 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 303 |
| Days with moderate air quality | 61 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Greenwood, DE | 1,170 | 36 | 28.0% |
| Seaford, DE | 8,163 | 36 | 28.0% |
| Farmington, DE | 190 | 36 | 28.0% |
| Federalsburg, MD | 2,773 | 36 | 28.0% |
| West Denton, MD | 14 | 36 | 28.0% |
| Bridgeville, DE | 3,626 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Campo, CA | 3,625 | 64 | 28.0% |
| Osage, IA | 3,625 | 15 | 70.0% |
| State Line, PA | 3,625 | 40 | 20.0% |
| Mission Hills, CA | 3,627 | 46 | 8.0% |
| Duncan, SC | 3,627 | 44 | 12.0% |
| Bridgeville, DE | 3,626 | 36 | 28.0% |
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