Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
January | 28°F | 47°F | 37°F | 2.7" |
February | 29°F | 50°F | 38°F | 2.3" |
March | 37°F | 60°F | 47°F | 3.2" |
April | 47°F | 71°F | 58°F | 3.4" |
May | 56°F | 78°F | 67°F | 4.6" |
June | 67°F | 87°F | 77°F | 5.3" |
July | 72°F | 91°F | 81°F | 4.2" |
August | 70°F | 90°F | 79°F | 3.2" |
September | 63°F | 83°F | 72°F | 3.5" |
October | 52°F | 72°F | 61°F | 5.0" |
November | 40°F | 61°F | 50°F | 2.5" |
December | 33°F | 52°F | 42°F | 3.8" |
Index | Old Town North | Alexandria | Virginia |
Air quality index | 47 | 47 | 58 |
Pollution index | 2,776,590 | 2,776,590 | 1,561,881 |
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 | 0.070% |
Benzene | 0.020% |
Carbon Tetrachloride | 0.010% |
Lead | 0.020% |
Mercury | 0.030% |
City | Population | Air Quality Index | National Avg. |
Silver Spring, MD | 81,069 | 47 | 6.0% |
Waldorf, MD | 77,711 | 47 | 6.0% |
Lake Arbor, MD | 13,720 | 47 | 6.0% |
Melwood, MD | 3,923 | 47 | 6.0% |
Woodmore, MD | 4,698 | 47 | 6.0% |
Alexandria, VA | 158,309 | 47 | 6.0% |
City | Population | Air Quality Index | National Avg. |
Hayward, CA | 158,817 | 43 | 14.0% |
Lancaster, CA | 157,697 | 72 | 44.0% |
Barrie, ON | 159,618 | n/a | |
Coquitlam, BC | 159,980 | n/a | |
Abbotsford, BC | 160,174 | n/a | |
Alexandria, VA | 158,309 | 47 | 6.0% |