| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 44°F | 34°F | 2.9" |
| February | 25°F | 47°F | 35°F | 2.9" |
| March | 34°F | 57°F | 45°F | 5.0" |
| April | 43°F | 70°F | 56°F | 4.1" |
| May | 54°F | 77°F | 65°F | 4.0" |
| June | 62°F | 85°F | 73°F | 5.4" |
| July | 67°F | 89°F | 77°F | 9.1" |
| August | 65°F | 87°F | 75°F | 5.1" |
| September | 58°F | 80°F | 68°F | 11.6" |
| October | 46°F | 70°F | 57°F | 7.0" |
| November | 35°F | 58°F | 45°F | 6.5" |
| December | 30°F | 49°F | 39°F | 2.7" |
| Index | Yorkshire | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 205,216 | 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 | 0.001% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| New Baltimore, VA | 11,017 | 38 | 24.0% |
| Bull Run Mountain Estates, VA | 1,777 | 38 | 24.0% |
| McLean, VA | 48,566 | 47 | 6.0% |
| Lorton, VA | 20,924 | 47 | 6.0% |
| Neabsco, VA | 17,038 | 47 | 6.0% |
| Yorkshire, VA | 9,118 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Fallston, MD | 9,118 | 46 | 8.0% |
| Clinton, OK | 9,117 | 43 | 14.0% |
| Columbia City, IN | 9,115 | 45 | 10.0% |
| Greenville, RI | 9,114 | 44 | 12.0% |
| New Glasgow, NS | 9,114 | n/a | |
| Yorkshire, VA | 9,118 | 47 | 6.0% |
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