SANTA BARBARA, Calif. — The massive wildfire that California has been battling since early December has now ballooned into the third largest in the state's history, burning a record amount of acreage, officials said Saturday.

Steve Concialdi of the Orange County Fire Authority said the Thomas Fire, which started Dec. 4 in Santa Paula, has now burned 259,000 acres.

That exceeds the devastating Rim Fire southeast of Sacramento in 2013 by 2,000 acres, and outsizes New York City, which measures more than 195,000 acres.

"As of this morning, we're at 259,000 acres and still growing," Concialdi said.

The region has had "red flag" — or hot, dry and windy — conditions for an unprecedented 13 consecutive days.

The National Weather Service says those conditions would last at least through Saturday evening, with winds gusting to 40 mph in the Santa Barbara County mountains where the fire is burning.

Related: California faces ‘new normal’ of intense wildfires, governor says

Everything about the fire was massive, from a footprint larger than that of many cities to the sheer scale of destruction that cremated entire neighborhoods or the legions attacking it: about 8,300 firefighters from nearly a dozen states, aided by 78 bulldozers and 29 helicopters that were dropping thousands of gallons of water on fires and hot spots.

Flames from a back firing operation underway rise behind a home off Ladera Ln near Bella Vista Drive in Santa Barbara, California on Dec. 14, 2017. Mike Eliason / Santa Barbara County Fire Department via AP

Firefighting costs were approaching $89 million.

The Thomas Fire surging through Ventura and Santa Barbara counties has already burned more than 1,000 buildings, including well over 750 homes.

Another 18,000 buildings are still in jeopardy, including mansions in the wealthy enclave of Montecito. Some 315 fire engines are stationed in and around homes in Montecito and Santa Barbara, along with "hand crews" armed with equipment like chain saws and drop torches. Another 200 fire engines are on standby.

Related: 1st death in California wildfires reported, firefighters make progress

Concialdi said authorities are hoping to have the blaze contained by Jan. 7.

On Saturday, Cal Fire tweeted that another major blaze, San Diego County's Lilac Fire, which tore through 4,100 acres, was 100 percent contained.

Santa Barbara has had only a tiny amount of rain since Oct. 1, the start of the new water year, and is more than 3 inches below normal to date.

Firefighters battle the blaze on Dec. 15, 2017, in Fillmore, California. Paul Kuroda / Zuma Press

Another focus of firefighting was on the eastern flank in canyons where a state firefighter was killed Thursday near the agricultural town of Fillmore. Cory Iverson, 32, died of thermal injuries and smoke inhalation, the Ventura County Medical Examiner Office said Saturday.

"When that happened, this fire hit a whole new level because all the firefighters know that could have been them," Concialdi said. "When you lose a fellow brother, that hits all of us and our families extremely hard."