| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 50°F | 39°F | 5.8" |
| February | 30°F | 54°F | 41°F | 5.1" |
| March | 38°F | 64°F | 50°F | 4.4" |
| April | 47°F | 73°F | 60°F | 6.0" |
| May | 56°F | 79°F | 67°F | 9.2" |
| June | 64°F | 87°F | 75°F | 5.8" |
| July | 69°F | 91°F | 79°F | 4.3" |
| August | 68°F | 89°F | 77°F | 6.3" |
| September | 61°F | 83°F | 71°F | 8.7" |
| October | 48°F | 73°F | 60°F | 6.0" |
| November | 37°F | 62°F | 49°F | 6.6" |
| December | 33°F | 55°F | 43°F | 6.8" |
| Index | Keysville | Virginia | National |
| Air quality index | 26 | 58 | 42 |
| Pollution index | 2,138,400 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 108 |
| Days with good air quality | 107 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 1.340% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Drakes Branch, VA | 518 | 26 | 48.0% |
| Phenix, VA | 379 | 26 | 48.0% |
| Fairview, VA | 145 | 26 | 48.0% |
| Charlotte Court House, VA | 756 | 26 | 48.0% |
| Clover, VA | 536 | 26 | 48.0% |
| Keysville, VA | 814 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Adair, IA | 814 | 39 | 22.0% |
| Science Hill, KY | 814 | 40 | 20.0% |
| Cleveland, NY | 814 | 37 | 26.0% |
| Poestenkill, NY | 814 | 37 | 26.0% |
| Eastview, TN | 814 | 27 | 46.0% |
| Keysville, VA | 814 | 26 | 48.0% |
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