Weather Records

The official U.S. Weather Service Reporting Station located at the Mile High Swinging Bridge has been providing daily weather observations since August 1955.

With rare exceptions, the temperature will be 10 to 20 degrees cooler at Grandfather Mountain than in the flatlands below. The average rate is 2.2 degrees per 1,000 feet, meaning that for each thousand feet gained, the air is 2.2 degrees cooler.

  Rainfall  
Average Annual Rainfall 63.14 in.  
Most Rain in One Day 11.3 in. September 8, 2004
Most Rain in Two Days 12.15 in. September 7-8, 2004
Most Rain in One Month 32.3 in. September 2004
Least Rain in One Month 0.31 in. October 1963

 

Wind Speed
Since February 2007 when the NWS approved meter was installed:
Highest recorded wind speed
121.3 mph February 13, 2019

 

  Snowfall  
Average Winter Snow 52.65 in.  
Most Snow in One Winter 129 in. 1959-60
Least Snow in One Winter 7.5 in. 1957-58
Most Snow in One Month 55.06 in. January 1977
Most Snow in One Day 24 in. March 16, 1993
Earliest Fall Snow   September 10, 1964
Latest Spring Snow   May 27, 1961

 

Temperature Records (In Degrees Fahrenheit)
Highest Temperature 83 degrees Various dates
Lowest Temperature -32 degrees January 21, 1985

 

Average Daily Temperatures by month
  Ave. High Ave. Low
January 35.37 19.86
February 37.55 21.86
March 44.61 28.63
April 53.95 37.10
May 60.77 45.47
June 66.46 53.08
July 69.37 56.57
August 68.23 56.03
September 62.88 50.68
October 54.29 40.73
November 46.10 31.83
December 38.83 24.26