What a typical winter is like at Keystone: how often it snows (or rains), how cold it gets at the base, mid-mountain and summit, and how much sun to expect, week by week, from 40 years of weather data.
How often Keystone gets measurable precipitation (rain vs. snow), and typical high/low temperatures, December 1–April 15, based on 40 years of real ERA5 reanalysis data.
Precipitation calibrated against real observations from the Grizzly Peak SNOTEL station (×1.54 correction). See full station data
How much of Keystone's theoretically possible winter sunshine it actually gets, December–March, based on 40 years of real ERA5 satellite/reanalysis solar radiation data compared against a clear-sky model.
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