| 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 | Blades | Delaware | National |
| Air quality index | 36 | 41 | 42 |
| Pollution index | 7,219,540 | 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 | 0.060% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.030% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Bridgeville, DE | 3,508 | 36 | 28.0% |
| Laurel, DE | 4,311 | 36 | 28.0% |
| Federalsburg, MD | 2,668 | 36 | 28.0% |
| Williston, MD | 174 | 36 | 28.0% |
| Greenwood, DE | 1,127 | 36 | 28.0% |
| Blades, DE | 1,123 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Cotter, AR | 1,123 | 36 | 28.0% |
| Centennial Park, AZ | 1,123 | 44 | 12.0% |
| Greenleaf, ID | 1,123 | 36 | 28.0% |
| Morrisonville, IL | 1,123 | 40 | 20.0% |
| Pasadena Hills, MO | 1,123 | 54 | 8.0% |
| Blades, DE | 1,123 | 36 | 28.0% |
Here are the best places to live in Delaware
Top 10 cities in Delaware with the best education system
Check out the 10 safest cities in Delaware
10 Best cities in Delaware for employment