SAN DIEGO (AP) — Oddly enough, even polar bears at the San Diego Zoo are getting a helping hand with the unseasonable freezing temperatures sweeping across California.

Zookeepers turned up the heat for some animals and offered shelter to polar bears as a cold snap continues through the weekend, promising to bring the coldest overnight temperatures.

While polar bears tolerate frigid climes, the zoo animals lack the fat layers that naturally occur in the wild to fully protect them from the cold so zookeepers offer them shelter and "warming apparatuses" in case they seek it, zoo spokeswomanJenny Mehlow said.

"The animals do take this in stride because they're wearing a nice, warm fur coat," she said.

The National Weather Service forecasted near-record low temperatures Saturday and Sunday nights.

Frost and freeze warnings were in effect early Sunday for parts of San Diego County with lows in some areas dipping to 25 and even lower in the mountains, according to the weather service. On Saturday, the town of Ramona in eastern San Diego County recorded a low of 23 degrees, breaking the 24 degrees set in 2007.