NEW YORK — Americans jumped on deals and promotions offered online on Cyber Monday, spending $1 billion and making it the busiest online shopping day ever, according to new data.

Research firm comScore says revenue rose 16 percent from a year ago to $1.03 billion on the Monday after Thanksgiving, the first one-day spending total above $1 billion ever. Since the beginning of November, online sales are up 13 percent to $13.55 billion.

Shoppers responded to the deals and bargains they found online, comScore Chairman Gian Fulgoni said. Whether they continue to do so in December isn’t yet clear.

“While we anticipate that there will be more billion-dollar spending days ahead as we get deeper into the season, only time will tell if overall consumer online spending remains at the elevated levels we’ve seen thus far,” he said in a statement.