| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 48°F | 40°F | 5.9" |
| February | 33°F | 50°F | 41°F | 3.9" |
| March | 40°F | 58°F | 48°F | 8.0" |
| April | 49°F | 68°F | 58°F | 4.6" |
| May | 58°F | 76°F | 66°F | 11.8" |
| June | 67°F | 84°F | 75°F | 6.6" |
| July | 72°F | 88°F | 79°F | 7.6" |
| August | 69°F | 86°F | 77°F | 7.9" |
| September | 64°F | 80°F | 71°F | 9.6" |
| October | 53°F | 72°F | 62°F | 8.0" |
| November | 43°F | 60°F | 51°F | 3.5" |
| December | 37°F | 53°F | 45°F | 7.3" |
| Index | Accomac | Virginia | National |
| Air quality index | 41 | 58 | 42 |
| Pollution index | 2,109,850 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 304 |
| Days with moderate air quality | 58 |
| Days w/ poor A.Q. for sensitive groups | 3 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Wattsville, VA | 622 | 36 | 28.0% |
| Mappsville, VA | 536 | 36 | 28.0% |
| Oak Hall, VA | 70 | 36 | 28.0% |
| Atlantic, VA | 561 | 36 | 28.0% |
| Hallwood, VA | 264 | 36 | 28.0% |
| Accomac, VA | 855 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Klawock, AK | 855 | 20 | 60.0% |
| Piper City, IL | 855 | 42 | 16.0% |
| Freeport, MN | 855 | 32 | 36.0% |
| Trego, MT | 855 | 37 | 26.0% |
| Tohatchi, NM | 855 | 17 | 66.0% |
| Accomac, VA | 855 | 41 | 18.0% |
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