| 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 | Annandale | 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. |
| Manassas Park, VA | 17,548 | 47 | 6.0% |
| Centreville, VA | 74,230 | 47 | 6.0% |
| Forest Heights, MD | 2,739 | 47 | 6.0% |
| Hillcrest Heights, MD | 16,498 | 47 | 6.0% |
| Temple Hills, MD | 8,221 | 47 | 6.0% |
| Annandale, VA | 42,240 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Odenton, MD | 42,258 | 46 | 8.0% |
| North Fort Myers, FL | 42,315 | 36 | 28.0% |
| West Babylon, NY | 42,316 | 51 | 2.0% |
| Pine Bluff, AR | 42,323 | 45 | 10.0% |
| Linden, NJ | 42,332 | 51 | 2.0% |
| Annandale, VA | 42,240 | 47 | 6.0% |
Here are the best places to live in Virginia
10 Best cities in Virginia for employment
Top 10 best public schools in Annandale
Check out the 10 safest cities in Virginia