| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 55°F | 44°F | 5.9" |
| February | 35°F | 57°F | 45°F | 7.1" |
| March | 42°F | 65°F | 53°F | 6.6" |
| April | 51°F | 74°F | 62°F | 8.3" |
| May | 59°F | 80°F | 69°F | 8.5" |
| June | 68°F | 87°F | 77°F | 13.5" |
| July | 72°F | 89°F | 80°F | 8.2" |
| August | 71°F | 88°F | 78°F | 19.4" |
| September | 65°F | 82°F | 73°F | 24.1" |
| October | 54°F | 75°F | 63°F | 15.3" |
| November | 43°F | 64°F | 52°F | 3.5" |
| December | 39°F | 59°F | 48°F | 8.7" |
| Index | Grimesland | North Carolina | National |
| Air quality index | 0 | 35 | 42 |
| Pollution index | 3,449,020 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 352 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.050% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.030% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Bear Grass, NC | 82 | 0 | 100.0% |
| River Road, NC | 3,578 | 0 | 100.0% |
| Chocowinity, NC | 1,331 | 0 | 100.0% |
| Washington, NC | 9,555 | 0 | 100.0% |
| Washington Park, NC | 601 | 0 | 100.0% |
| Grimesland, NC | 392 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Mount Pleasant, AR | 392 | 36 | 28.0% |
| Uplands Park, MO | 392 | 54 | 8.0% |
| Ekalaka, MT | 392 | 33 | 34.0% |
| Sunburst, MT | 392 | 21 | 58.0% |
| Goldston, NC | 392 | 29 | 42.0% |
| Grimesland, NC | 392 | 0 | 100.0% |
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