Topography and Climate
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 Temperature (47.9 degrees)
Average January Low Temperature (25.9 degrees)
Average July High Temperature (86.6 degrees)
Average July Low Temperature (62.8 degrees)
Mean Annual Temperature (56.0 degrees)
Average Annual Rainfall - 44 inches
Average Annual Snowfall - 14 inches
Average Growing Season - 180 days
Average Relative Humidity - 66%
Frost Free Nights - Average April 20 - October 16
Prevailing Winds - Westerly
Slope - 3/4 of the county is level to rolling
Air Quality - Franklin County is classified as an attainment area for all pollutants by both state and federal agencies.