Crater Lake National Park's Frequently Asked Questions
Crater Lake Institute - http://www.craterlakeinstitute.com/
Answer: The average snowfall at Crater Lake is 533 inches every year. That’s about 45 feet. The greatest cumulative snowfall for one season was 879 inches (73 feet) the winter of 1932-33. The greatest depth on the ground at one time was 258 inches (21½ feet) the winter of 1983. Most of the snow usually melts by the beginning of August, although after particularly heavy seasons, there are drifts that fail to melt before the snows return again in the early Fall.