| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 47°F | 37°F | 3.4" |
| February | 25°F | 47°F | 36°F | 2.3" |
| March | 33°F | 56°F | 45°F | 3.0" |
| April | 42°F | 67°F | 55°F | 3.7" |
| May | 50°F | 75°F | 62°F | 3.9" |
| June | 62°F | 84°F | 73°F | 5.9" |
| July | 66°F | 88°F | 77°F | 4.3" |
| August | 64°F | 87°F | 75°F | 2.9" |
| September | 57°F | 80°F | 68°F | 4.4" |
| October | 47°F | 70°F | 58°F | 5.2" |
| November | 38°F | 59°F | 49°F | 4.7" |
| December | 30°F | 50°F | 40°F | 4.9" |
| Index | Powellville | Maryland | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 2,538,160 | 5,342,367 | 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 | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Millville, DE | 1,484 | 36 | 28.0% |
| West Ocean City, MD | 4,661 | 36 | 28.0% |
| Bishopville, MD | 634 | 36 | 28.0% |
| Salisbury, MD | 32,850 | 36 | 28.0% |
| Fruitland, MD | 5,281 | 36 | 28.0% |
| Powellville, MD | 109 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Eagle, AK | 109 | 38 | 24.0% |
| Mud Bay, AK | 109 | 20 | 60.0% |
| Standing Rock, AL | 109 | 42 | 16.0% |
| Kohls Ranch, AZ | 109 | 60 | 20.0% |
| Vilas, CO | 109 | 20 | 60.0% |
| Powellville, MD | 109 | 36 | 28.0% |
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