| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 49°F | 38°F | 3.1" |
| February | 28°F | 50°F | 39°F | 2.6" |
| March | 35°F | 57°F | 46°F | 3.3" |
| April | 45°F | 67°F | 55°F | 3.4" |
| May | 54°F | 75°F | 64°F | 3.5" |
| June | 65°F | 84°F | 74°F | 4.7" |
| July | 70°F | 88°F | 78°F | 4.5" |
| August | 68°F | 86°F | 77°F | 5.3" |
| September | 62°F | 81°F | 71°F | 5.5" |
| October | 52°F | 72°F | 61°F | 5.6" |
| November | 40°F | 61°F | 50°F | 2.9" |
| December | 33°F | 54°F | 43°F | 4.4" |
| Index | Mappsville | Virginia | National |
| Air quality index | 36 | 58 | 42 |
| Pollution index | 2,109,850 | 1,561,881 | 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 | 0.003% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Chincoteague, VA | 2,885 | 36 | 28.0% |
| Atlantic, VA | 561 | 36 | 28.0% |
| Greenbackville, VA | 35 | 36 | 28.0% |
| Hallwood, VA | 264 | 36 | 28.0% |
| Modest Town, VA | 224 | 36 | 28.0% |
| Mappsville, VA | 536 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Holly Grove, AR | 536 | 43 | 14.0% |
| Cumming, IA | 536 | 39 | 22.0% |
| Bismarck, IL | 536 | 42 | 16.0% |
| Chapin, IL | 536 | 40 | 20.0% |
| Fithian, IL | 536 | 42 | 16.0% |
| Mappsville, VA | 536 | 36 | 28.0% |
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