 At the park headquarters, with an elevation of 3,966 feet (1,209 m), January averages 38.2°F (3.4°C), while July averages 73.0°F (22.8°C), though in summer the nights are much cooler than the hot days. There are an average of 39.5 days with highs of 90°F (32°C) or higher and an average of 97.9 nights with freezing temperatures. Freezing temperatures have been recorded in every month of the year. The record high temperature was 115°F (46°C) on July 20, 1915, while the record low temperature was − 6°F (− 21°C) on January 2, 1924 and on January 21, 1937. Average annual precipitation is nearly 37 inches (940 mm), falling on 65 days. The wettest year was 1983 with 68.94 inches (1,751 mm) and the driest year was 1976 with 14.84 inches (377 mm). The most precipitation in one month was 29.61 inches (752 mm) in December 1955 and the most in one day was 6.92 inches (176 mm) on December 23, 1955. Average annual snowfall is 65.6 inches (1.67 m). The snowiest year was 1967 with 154.9 inches (3.93 m). The most snow in one month was 140.8 inches (3.58 m) in January 1993.
