Winter Storm Xylia Becomes Eighth Storm Since September to Smash Significant Snow Records The Weather Channel 3/15/2021 Jonathan Erdman Winter Storm Xylia has become the eighth storm since September to shatter major snowfall records in what has otherwise been a mild winter season overall in most of the United States. Xylia buried Cheyenne, Wyoming, with 30.8 inches of snow March 13-14. Of that total, 22.7 inches fell on March 14, alone, which set a new record for the heaviest calendar-day snowfall in more than 135 years of weather records in the Wyoming capital, topping a 19.8-inch total from Nov. 20, 1979. Although not a record, Xylia was the fourth-heaviest snowstorm on record in Denver (27.1 inches).