This week's frigid temperatures means heating bills will skyrocket come the end of the month.
Both daytime and overnight temperatures were well below normal for much of the week with lows in the mid 20s in some areas.
Freeze warnings expired Friday morning, but a Winter Weather Advisory is up through the weekend.
The Santa Clara County medical examiner said four people died overnight of hypothermia. Read more here.
Bay Area Snow Flurries & Jeff's Cold Forecast
The weekend is supposed to be a bit warmer, but there is a potential we could wake up Saturday to snow on Bay Area peaks.
NBC Bay Area meterologist Christina Loren says snow could fall as low as 1,500 feet with real accumulation on both Mount Hamilton and Mount Diablo. Snow is also possible in the Santa Cruz Mountains.
She says snow flurries, or a mix of snow and rain is forecast as low as 500 feet.
The rest of us should be ready for rain or showers off and on throughout the day, but highs will make it to the 50s.
MORE: 7-Day Forecast
Earlier in the week the Bay Area was under a freeze warning. Black ice warnings were out for drivers on smaller bridges, elevated roadways or who happen to drive past a leaky sprinkler first thing in the morning.
Freezing Friday in the North Bay
Because of the weather, homeless people were urged to find shelter and farmers were out protecting their fruit.
The Marin Municipal Water District is also warning people to wrap up exposed pipes with foam insulation or install special blankets for backflow devices. As an alternative people can also use old towels or blankets secured with twine or wire.
In the event where pipes do freeze people are advised to slowly turn on their water faucet to melt the ice, according to the district. Water in garden hoses should be drained before they are coiled.
Plants can also be protected by setting up tents with old sheets or tarps
PHOTOS: Bay Area ColdWeather Photos