| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 46°F | 34°F | 2.7" |
| February | 25°F | 48°F | 36°F | 2.1" |
| March | 33°F | 58°F | 45°F | 3.2" |
| April | 43°F | 71°F | 56°F | 3.7" |
| May | 52°F | 78°F | 65°F | 5.6" |
| June | 61°F | 86°F | 74°F | 4.5" |
| July | 66°F | 90°F | 78°F | 4.2" |
| August | 65°F | 88°F | 76°F | 2.8" |
| September | 58°F | 82°F | 69°F | 3.5" |
| October | 46°F | 71°F | 58°F | 5.4" |
| November | 35°F | 59°F | 46°F | 2.6" |
| December | 29°F | 50°F | 39°F | 3.8" |
| Index | Reston | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 380,124 | 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 | 0.005% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Woodburn, VA | 10,081 | 38 | 24.0% |
| North Bethesda, MD | 49,719 | 47 | 6.0% |
| Travilah, MD | 11,239 | 47 | 6.0% |
| Fair Lakes, VA | 8,398 | 47 | 6.0% |
| Greenbriar, VA | 7,976 | 47 | 6.0% |
| Reston, VA | 61,418 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| National City, CA | 61,342 | 64 | 28.0% |
| Spring, TX | 61,514 | 52 | 4.0% |
| Burnsville, MN | 61,536 | 46 | 8.0% |
| Taylor, MI | 61,164 | 56 | 12.0% |
| Moore, OK | 61,683 | 48 | 4.0% |
| Reston, VA | 61,418 | 47 | 6.0% |
Here are the best places to live in Virginia
These are the 10 most affordable cities in Virginia
Top 10 cities in Virginia with the best education system
Top 10 best public schools in Reston