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 | Dale City | Virginia | National |
Air quality index | 47 | 58 | 42 |
Pollution index | 520,936 | 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 | 0.020% |
Benzene | 0.010% |
Carbon Tetrachloride | 0.002% |
Lead | 0.050% |
Mercury | 0.001% |
City | Population | Air Quality Index | National Avg. |
Manassas, VA | 41,038 | 47 | 6.0% |
Bull Run, VA | 16,769 | 47 | 6.0% |
Yorkshire, VA | 9,118 | 47 | 6.0% |
Fort Hunt, VA | 16,383 | 47 | 6.0% |
Indian Head, MD | 3,803 | 47 | 6.0% |
Dale City, VA | 72,062 | 47 | 6.0% |
City | Population | Air Quality Index | National Avg. |
Decatur, IL | 71,857 | 44 | 12.0% |
Frederick, MD | 71,843 | 40 | 20.0% |
Lauderhill, FL | 71,827 | 41 | 18.0% |
Pawtucket, RI | 71,821 | 44 | 12.0% |
Pittsburg, CA | 71,723 | 40 | 20.0% |
Dale City, VA | 72,062 | 47 | 6.0% |