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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 46°F | 34°F | 2.7" |
| February | 25°F | 48°F | 36°F | 2.1" |
| March | 33°F | 58°F | 45°F | 3.2" |
| April | 43°F | 71°F | 56°F | 3.7" |
| May | 52°F | 78°F | 65°F | 5.6" |
| June | 61°F | 86°F | 74°F | 4.5" |
| July | 66°F | 90°F | 78°F | 4.2" |
| August | 65°F | 88°F | 76°F | 2.8" |
| September | 58°F | 82°F | 69°F | 3.5" |
| October | 46°F | 71°F | 58°F | 5.4" |
| November | 35°F | 59°F | 46°F | 2.6" |
| December | 29°F | 50°F | 39°F | 3.8" |
| Index | Wolf Trap | 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. |
| Buckhall, VA | 18,116 | 47 | 6.0% |
| Chantilly, VA | 23,820 | 47 | 6.0% |
| Stone Ridge, VA | 15,034 | 47 | 6.0% |
| Sudley, VA | 18,019 | 47 | 6.0% |
| Olney, MD | 35,350 | 47 | 6.0% |
| Wolf Trap, VA | 16,497 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Hillcrest Heights, MD | 16,498 | 47 | 6.0% |
| East Highland Park, VA | 16,499 | 44 | 12.0% |
| Greater Napanee, ON | 16,500 | n/a | |
| Four Corners, OR | 16,491 | 32 | 36.0% |
| Buda, TX | 16,484 | 44 | 12.0% |
| Wolf Trap, VA | 16,497 | 47 | 6.0% |