Weather instruments are accessible to the public in two locations. A wind gauge and a digital thermometer are located across from the main entry to the Visitor Center and a computerized weather readout is incorporated into the weather exhibit in the Nature Museum.
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 | 62.65 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 | ||
| Highest observed wind speed | 200 mph | January 25, 2006 |
| Since the year 2000 when the 24/7 meter
was installed: Ave. Number of Days Per Year Winds in excess of 60 mph |
92 days | |
| Since the year 2000 when the 24/7 meter
was installed: Ave. Number of Days Per Year Winds in excess of 100 mph |
24 days | |
| Snowfall | ||
| Average Winter Snow | 55.68 in. | |
| Most Snow in One Winter | 116 in. | 1995-96 |
| Least Snow in One Winter | 8.14 in. | 1956-57 |
| Most Snow in One Month | 54 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 | August 23, 1983 |
| Lowest Temperature | -32 degrees | January 21, 1985 |
| Average Daily Temperatures by month | ||
| Ave. High | Ave. Low | |
| January | 35.43 | 19.89 |
| February | 37.58 | 21.88 |
| March | 44.51 | 28.41 |
| April | 53.74 | 36.85 |
| May | 60.8 | 45.37 |
| June | 66.03 | 52.7 |
| July | 69.12 | 56.40 |
| August | 68.10 | 55.87 |
| September | 62.62 | 50.44 |
| October | 56.06 | 40.63 |
| November | 46.15 | 31.98 |
| December | 38.6 | 23.9 |