FAIRFIELD, IA - DECEMBER 22: Former Secretary of State Hillary Clinton speaks and meets with Iowa voters at a town hall meeting in Fairfield, Iowa on Tuesday evening December 22, 2015. (Photo by Melina Mara/The Washington Post)

Hillary Clinton's campaign announced Friday that it raised $55 million in the final fundraising period of 2015, and $112 million in primary-election funds for the year. Clinton brought in $37 million in money specifically for use in the primary during the fourth quarter of 2015.

Clinton also raised $3 million for the general election. Her annual total is the most for any non-incumbent in a non-election year and roughly equal to what President Obama raised as a sitting president ahead of the 2012 election, the campaign said.

The totals are further evidence of the Democratic front-runner's fund-raising muscle, despite public fretting from her campaign that the numbers might slip or that challenger Sen. Bernie Sanders might out-raise her.

The campaign had set a 2015 goal of $100 million for use during the primary period. The campaign exceeded that, leaving about $38 million in the bank.

The Iowa caucuses are a month away, meaning heavier travel and more expensive advertising and other costs as the primary fight with Sanders nears its first test.

Clinton kept up a steep burn rate in the fourth quarter, racing through nearly $33 million -- almost 86 percent of the $37 million she raised over the last three months for her campaign. That’s up from the more than $25 million she spent in the third quarter of the year, when she raised $29.4 million and spent 86 percent of it. Overall, Clinton spent more than $76 million last year, with huge investments in digital technology and an on-the-ground network of organizers.

It remains to be seen how her resources compare with those of Sen. Bernie Sanders, who nearly matched her fundraising in the fall, bringing in $26.2 million. His campaign’s burn rate in the third quarter was half of Clinton’s.

For the first time since she entered the 2016 race last April, Clinton raised money for a general election contest as well, bringing in $1 million for her own campaign's use and $18 million for the Democratic Party in the fourth quarter. Most of that came from a single big-dollar fund-raising event in New York last month.

"Thanks to the hundreds of thousands of Americans who have joined together and powered this historic campaign, we are now heading into Iowa and New Hampshire with the resources we need to be successful," said Clinton campaign manager Robby Mook.

The Clinton campaign shilled hard in recent days, emailing supporters in the names of Bill and Chelsea Clinton, among others, to ask for last-minute donations. Clinton's own name was on one such appeal to Democrats titled, "If We Lose."

Political contributions logged through midnight on Dec. 31 count for the fourth quarter and for the 2015 year. The figures released by the campaign will be included in a more detailed report due to the Federal Election Commission by Jan. 31.

Supporters are limited to donations of $2,700 apiece for the primary period, and most of the fundraising parties Clinton attends are geared to bringing in that maximum contribution from each attendee. The Clinton campaign said, however, that 94 percent  of donations in the fourth quarter arrived in increments of $100 or less.

The campaign also said that more than 60 percent of donors for the year were women.

Related:

Inside the Clinton donor network

Why so many women are raising money for Hillary Clinton