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 | Merrifield | Virginia | National |
Air quality index | 47 | 58 | 42 |
Pollution index | 208,434 | 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 | 0.002% |
Carbon Tetrachloride | 0.001% |
Lead | 0.001% |
Mercury | 0.000% |
City | Population | Air Quality Index | National Avg. |
Silver Spring, MD | 81,069 | 47 | 6.0% |
Chantilly, VA | 23,820 | 47 | 6.0% |
Loch Lomond, VA | 4,325 | 47 | 6.0% |
Fort Washington, MD | 24,468 | 47 | 6.0% |
National Harbor, MD | 3,998 | 47 | 6.0% |
Merrifield, VA | 18,523 | 47 | 6.0% |
City | Population | Air Quality Index | National Avg. |
Lake Shore, MD | 18,523 | 46 | 8.0% |
Concord, MO | 18,521 | 54 | 8.0% |
Brookfield, IL | 18,520 | 55 | 10.0% |
Winchester, KY | 18,520 | 42 | 16.0% |
Milledgeville, GA | 18,526 | 38 | 24.0% |
Merrifield, VA | 18,523 | 47 | 6.0% |