| 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 | Marshall | Virginia | National |
| Air quality index | 38 | 58 | 42 |
| Pollution index | 1,198,990 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 333 |
| Days with moderate air quality | 32 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Bull Run Mountain Estates, VA | 1,777 | 38 | 24.0% |
| New Baltimore, VA | 11,017 | 38 | 24.0% |
| The Plains, VA | 168 | 38 | 24.0% |
| Warrenton, VA | 9,928 | 38 | 24.0% |
| Middleburg, VA | 573 | 38 | 24.0% |
| Marshall, VA | 2,913 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| East Norwich, NY | 2,913 | 51 | 2.0% |
| Attica, NY | 2,912 | 39 | 22.0% |
| Woodlynne, NJ | 2,911 | 51 | 2.0% |
| Experiment, GA | 2,915 | 52 | 4.0% |
| Bowling Green, FL | 2,910 | 36 | 28.0% |
| Marshall, VA | 2,913 | 38 | 24.0% |
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