Updated from Nov. 25 to include additional information in the seventh paragraph.
SAN DIEGO, CALIF. (TheStreet) -- The online holiday shopping season will be a record-setting one with consumers spending a total of $61 billion from their desktop computers and mobile devices this year, according to Internet analytics firm comScore (SCOR) , which Tuesday announced its digital commerce forecasts for the season.
The holiday commerce figure, which represents online buying during November and December, is up 16% over last year and includes $7.9 billion in purchases from shoppers on mobile devices. Mobile commerce, according to comScore's calculations, will grow 25% over 2013 and account for 13% of total online holiday spending this year, its highest percentage ever. During the calendar fourth quarter, mobile spending will surpass $10 billion for the first time ever.
The analytics firm defines "digital commerce" as the sum of all worldwide buying on U.S. sites -- excluding travel, auto, and auction sites -- from desktop and mobile devices. The firm's forecast reflects data collected from its panel of 2 million people and traffic from 1 million domains. The firm's e-commerce findings were shared during a Tuesday afternoon conference call hosted by the research department of Suntrust Robinson Humphrey.
Growth in digital commerce sales outgrew offline retail sales by a factor of four in the third quarter, comScore Chairman Gian Fulgoni said on the call. More than $1 of every $10 of consumers' discretionary expenditures is now spent on online, he added.
Particularly of note this holiday season, Cyber Monday will live up its namesake and repeat as the heaviest online spending in history as consumers will spend upwards of $2.45 billion -- more than $2 billion on desktop and $450 million on mobile -- this year. Thanksgiving Day is also expected to sneak its way into the fold of important digital shopping days and bring in at least $1 billion from desktop and mobile purchases, according to comScore's forecast.