| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 52°F | 41°F | 2.8" |
| February | 32°F | 54°F | 42°F | 2.6" |
| March | 40°F | 62°F | 50°F | 3.0" |
| April | 49°F | 73°F | 60°F | 3.5" |
| May | 58°F | 79°F | 68°F | 3.9" |
| June | 67°F | 87°F | 77°F | 4.5" |
| July | 71°F | 91°F | 80°F | 5.3" |
| August | 70°F | 88°F | 78°F | 5.4" |
| September | 64°F | 83°F | 73°F | 5.3" |
| October | 53°F | 74°F | 63°F | 6.0" |
| November | 41°F | 63°F | 52°F | 3.5" |
| December | 36°F | 56°F | 45°F | 3.6" |
| Index | Yorktown | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 203,556 | 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 | 0.002% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Mathews, VA | 683 | 40 | 20.0% |
| Newport News, VA | 179,582 | 40 | 20.0% |
| Scotland, VA | 146 | 40 | 20.0% |
| Gloucester Courthouse, VA | 2,969 | 40 | 20.0% |
| Poquoson, VA | 12,121 | 40 | 20.0% |
| Yorktown, VA | 286 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Cibola, AZ | 286 | 45 | 10.0% |
| Kalihiwai, HI | 286 | 13 | 74.0% |
| Hornick, IA | 286 | 35 | 30.0% |
| Pacific Junction, IA | 286 | 40 | 20.0% |
| Druid Hills, KY | 286 | 49 | 2.0% |
| Yorktown, VA | 286 | 40 | 20.0% |
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