Franklin County is the seventh largest county in Virginia by area, consisting of 692.1 square miles of land and 9.5 square miles of water. Altitude in the county varies from 900 feet above sea level to more than 3,200 feet. The highest point is Cahas Knob, near the Blue Ridge Parkway. Altitude in the Town of Rocky Mount ranges from 1,200 feet to 1,420.
Average January High (47.9 degrees)
Average January Low (25.9 degrees)
Average July High (86.6 degrees)
Average July Low (62.8 degrees)
Mean Annual Temperature (56.0 degrees)
Average April 20 - October 16
3/4 of the county is level to rolling
Franklin County is classified as an attainment area for all pollutants by both state and federal agencies.