| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 48°F | 41°F | 5.3" |
| February | 33°F | 45°F | 39°F | 2.4" |
| March | 40°F | 57°F | 49°F | 4.6" |
| April | 50°F | 67°F | 59°F | 11.1" |
| May | 56°F | 73°F | 64°F | 5.5" |
| June | 68°F | 85°F | 76°F | 7.6" |
| July | 72°F | 89°F | 80°F | 6.0" |
| August | 73°F | 88°F | 80°F | 8.7" |
| September | 67°F | 83°F | 75°F | 2.1" |
| October | 58°F | 74°F | 66°F | 17.8" |
| November | 46°F | 62°F | 53°F | 6.0" |
| December | 36°F | 51°F | 43°F | 6.1" |
| Index | Smithfield | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 1,644,650 | 1,561,881 | 2,726,193 |
| 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 | 0.070% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hampton, VA | 135,169 | 40 | 20.0% |
| Bethel Manor, VA | 4,666 | 40 | 20.0% |
| Windsor, VA | 2,748 | 40 | 20.0% |
| Newport News, VA | 179,582 | 40 | 20.0% |
| Carrollton, VA | 6,340 | 40 | 20.0% |
| Smithfield, VA | 8,492 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| South Kensington, MD | 8,494 | 47 | 6.0% |
| Conover, NC | 8,488 | 43 | 14.0% |
| Los Altos Hills, CA | 8,496 | 43 | 14.0% |
| Hanover, ON | 8,487 | n/a | |
| Harrison, TN | 8,485 | 46 | 8.0% |
| Smithfield, VA | 8,492 | 40 | 20.0% |
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