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 |