| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 52°F | 43°F | 4.5" |
| February | 32°F | 48°F | 39°F | 3.5" |
| March | 39°F | 58°F | 47°F | 3.7" |
| April | 48°F | 66°F | 57°F | 7.6" |
| May | 56°F | 72°F | 64°F | 6.5" |
| June | 67°F | 83°F | 74°F | 11.3" |
| July | 72°F | 88°F | 79°F | 6.5" |
| August | 72°F | 87°F | 79°F | 7.8" |
| September | 66°F | 82°F | 74°F | 3.2" |
| October | 58°F | 73°F | 65°F | 16.2" |
| November | 44°F | 63°F | 52°F | 6.3" |
| December | 36°F | 52°F | 43°F | 6.5" |
| Index | Northampton | Hampton | Virginia |
| Air quality index | 40 | 40 | 58 |
| Pollution index | 1,644,650 | 4,048,910 | 1,561,881 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 317 |
| Days with moderate air quality | 48 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.130% |
| City | Population | Air Quality Index | National Avg. |
| Portsmouth, VA | 94,961 | 40 | 20.0% |
| Carrollton, VA | 6,340 | 40 | 20.0% |
| Newport News, VA | 179,582 | 40 | 20.0% |
| Yorktown, VA | 286 | 40 | 20.0% |
| Rushmere, VA | 1,001 | 40 | 20.0% |
| Hampton, VA | 135,169 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| West Valley City, UT | 135,610 | 51 | 2.0% |
| Warren, MI | 134,188 | 56 | 12.0% |
| Columbia, SC | 134,057 | 43 | 14.0% |
| Gainesville, FL | 133,611 | 35 | 30.0% |
| Coral Springs, FL | 133,370 | 41 | 18.0% |
| Hampton, VA | 135,169 | 40 | 20.0% |
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