U.S. consumers headed online to take care of last-minute holiday shopping, with shoppers on the East Coast spurred by a snowstorm that kept many home from stores, analytics firm comScore Inc said on Tuesday.

Online shopping jumped 13 percent from the same period a year ago to $767 million during the final weekend before Christmas, when snow blanketed much of the Northeast.

Online sales rose 6 percent to $4.8 billion last week, setting a one-week sales record. Tuesday, December 15, was the heaviest online spending day ever, with $913 million in transactions.

Retailers have been very aggressive with late season promotions while informing consumers that they could still get their purchases shipped in time for Christmas, and these tactics seem to be paying off, comScore Chairman Gian Fulgoni said in a statement.

For the first 50 days of the November-December holiday season, online spending reached $25.52 billion, up 4 percent from the corresponding days last year, comScore said.