| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 44°F | 34°F | 5.2" |
| February | 26°F | 47°F | 35°F | 6.2" |
| March | 35°F | 57°F | 45°F | 5.0" |
| April | 44°F | 68°F | 55°F | 6.9" |
| May | 52°F | 74°F | 62°F | 6.4" |
| June | 60°F | 82°F | 71°F | 11.7" |
| July | 64°F | 84°F | 73°F | 7.3" |
| August | 63°F | 83°F | 72°F | 6.6" |
| September | 56°F | 77°F | 65°F | 10.4" |
| October | 45°F | 67°F | 55°F | 12.8" |
| November | 34°F | 57°F | 44°F | 5.4" |
| December | 30°F | 49°F | 38°F | 6.2" |
| Index | Lafayette | Virginia | National |
| Air quality index | 41 | 58 | 42 |
| Pollution index | 884,118 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 306 |
| Days with moderate air quality | 55 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Boones Mill, VA | 149 | 38 | 24.0% |
| Salem, VA | 25,290 | 38 | 24.0% |
| Cave Spring, VA | 25,193 | 38 | 24.0% |
| Hollins, VA | 15,113 | 38 | 24.0% |
| Glenvar, VA | 821 | 38 | 24.0% |
| Lafayette, VA | 813 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilton, AL | 813 | 53 | 6.0% |
| Cottondale, FL | 813 | 35 | 30.0% |
| Tignall, GA | 813 | 44 | 12.0% |
| Colfax, IN | 813 | 42 | 16.0% |
| Castine, ME | 813 | 36 | 28.0% |
| Lafayette, VA | 813 | 41 | 18.0% |
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