Sunday night was the coldest so far in many Bay Area cities.
Clear skies were likely for the rest of Sunday evening, but lows were likely to be in the 30s in most parts of the Bay Area, with north winds up to 15 mph.
It has been so cold in the Bay Area that in Walnut Creek, man-made snow from an ice skating has not melted in hours. Temperatures are expected to reach as low as 25 degrees there Sunday night, according to The Weather Channel.
The cold, however, is not keeping everyone indoors.
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Pankaj Sharma of Dublin said she is braving the cold weather at the Walnut Creek ice skating rink "because of the fun."
"This is the first time my son is ice skating," she said. "You’ve got to get out. You just can’t stay home inside."
Sarah Carter works the cash register outside and was just finishing up her eight-hour shift before she spoke to NBC Bay Area.
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"I’ve got lots of layers on--a sweater, long socks and mittens," Carter said.
But this recent cold snap is coming at a steep cost for the state’s agriculture industry.
Citrus trees are freezing in the Central Valley where some farmers have lost 20 to 30 percent of their harvest.
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"We're losing a lot of money on this deal, and we may end up removing the trees," citrus farmer Brent Doyle said.
In the Bay Area, most of the wineries have already finished their harvests for the season and are not threatened by the recent freeze.
At Wente Vineyards in Livermore, the grapes were picked a couple of weeks ago.
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"The frost isn’t going to give us any trouble out here," Matt Rice of Wente Vineyards said. "There may be a few wineries with some grapes out there, biting their nails about the frost, but out here in the Livermore Valley, we’re harvested and ready for a nice winter."