| 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 | Barcroft | Arlington | Virginia |
| Air quality index | 47 | 47 | 58 |
| Pollution index | 208,434 | 208,434 | 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 | 0.003% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Beltsville, MD | 17,922 | 47 | 6.0% |
| Andrews AFB, MD | 3,316 | 47 | 6.0% |
| Camp Springs, MD | 21,829 | 47 | 6.0% |
| Friendly, MD | 9,984 | 47 | 6.0% |
| National Harbor, MD | 3,998 | 47 | 6.0% |
| Arlington, VA | 236,434 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Fremont, CA | 234,829 | 43 | 14.0% |
| Garland, TX | 238,622 | 51 | 2.0% |
| Hialeah, FL | 233,876 | 41 | 18.0% |
| Irving, TX | 240,475 | 51 | 2.0% |
| Regina, SK | 241,465 | n/a | |
| Arlington, VA | 236,434 | 47 | 6.0% |
Here are the best places to live in Virginia
Check out the 10 most dangerous cities in Virginia
These are the 10 cheapest cities in Virginia
These are the largest cities in Virginia