| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 35°F | 4.6" |
| February | 27°F | 48°F | 37°F | 4.1" |
| March | 36°F | 59°F | 47°F | 5.4" |
| April | 45°F | 70°F | 57°F | 6.6" |
| May | 54°F | 77°F | 66°F | 7.2" |
| June | 63°F | 86°F | 74°F | 10.2" |
| July | 67°F | 89°F | 78°F | 8.7" |
| August | 66°F | 87°F | 76°F | 7.4" |
| September | 59°F | 81°F | 69°F | 11.4" |
| October | 48°F | 70°F | 58°F | 8.8" |
| November | 37°F | 59°F | 47°F | 5.7" |
| December | 31°F | 50°F | 40°F | 5.9" |
| Index | Lorton | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 380,124 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 209 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.005% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Manassas Park, VA | 17,548 | 47 | 6.0% |
| Loch Lomond, VA | 4,325 | 47 | 6.0% |
| Fort Washington, MD | 24,468 | 47 | 6.0% |
| Marlow Heights, MD | 5,872 | 47 | 6.0% |
| Alexandria, VA | 158,309 | 47 | 6.0% |
| Lorton, VA | 20,924 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Battle Ground, WA | 20,931 | 38 | 24.0% |
| New Hope, MN | 20,913 | 46 | 8.0% |
| Lynn Haven, FL | 20,910 | 38 | 24.0% |
| Stephenville, TX | 20,887 | 33 | 34.0% |
| Pleasant Prairie, WI | 20,969 | 39 | 22.0% |
| Lorton, VA | 20,924 | 47 | 6.0% |
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