Storm warnings have been posted for much of the western part of the US, where deep snow is continuing to cause travel problems, BBC reported.
As much as 3ft (90cm) of snow was forecast in the San Juan mountains in south-west Colorado.
In California's Sierra Nevada, police shut down an 80-mile (129km) stretch of the Interstate 80 for several hours.
Thousands of travellers in North America have been delayed over the Christmas period by bad weather.
Canada was expecting a coast-to-coast white Christmas for the first time in 37 years.
In the US, about 2ft of snow fell overnight in the mountains around Lake Tahoe, bringing the total fall to 10ft over the past two weeks in some resorts, the Associated Press reported.
In Washington state, the roof of a school in Olympia collapsed under the weight of snow, ice and water. No injuries were reported.
On the east coast, in New Hampshire, winds blowing at more than 30mph cut power to thousands of homes and businesses in more than 100 communities.
Travel problems have been particularly severe at Chicago's O'Hare international airport, though no new delays or cancellations were reported there on Christmas Day.
More than 100 flights had been cancelled in Chicago on Christmas Eve, and the city's aviation department said it had requested 75 temporary beds for stranded passengers.
Weather problems at several other airports had led to a ripple effect across the country, with delays from San Francisco and Dallas to Boston and New York.
Rail services were also hit badly, with hundreds of passengers facing delays of up to 24 hours.
On the roads, at least 30 deaths have been blamed on the weather.