| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 54°F | 43°F | 3.8" |
| February | 35°F | 57°F | 45°F | 5.8" |
| March | 42°F | 65°F | 53°F | 3.4" |
| April | 51°F | 75°F | 63°F | 8.9" |
| May | 59°F | 81°F | 70°F | 6.0" |
| June | 68°F | 88°F | 77°F | 5.2" |
| July | 71°F | 90°F | 80°F | 5.8" |
| August | 70°F | 89°F | 78°F | 4.4" |
| September | 64°F | 83°F | 73°F | 8.0" |
| October | 53°F | 74°F | 63°F | 1.5" |
| November | 42°F | 65°F | 52°F | 2.9" |
| December | 38°F | 59°F | 48°F | 5.0" |
| Index | Grifton | North Carolina | National |
| Air quality index | 42 | 35 | 42 |
| Pollution index | 2,609,700 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 237 |
| Days with good air quality | 205 |
| Days with moderate air quality | 32 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Grimesland, NC | 392 | 0 | 100.0% |
| Greenville, NC | 92,826 | 38 | 24.0% |
| Simpson, NC | 462 | 38 | 24.0% |
| Ayden, NC | 5,138 | 38 | 24.0% |
| Bell Arthur, NC | 378 | 38 | 24.0% |
| Grifton, NC | 2,873 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Brighton, AL | 2,873 | 53 | 6.0% |
| Greensboro, MD | 2,873 | 42 | 16.0% |
| Florida, NY | 2,873 | 36 | 28.0% |
| Seagraves, TX | 2,873 | 45 | 10.0% |
| Elkton, VA | 2,872 | 36 | 28.0% |
| Grifton, NC | 2,873 | 42 | 16.0% |
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