If you woke up this morning wondering why you had no feeling in your fingers, you're not alone. A frost advisory was declared for parts of the Bay Area — with temperatures reported as low as the 30's — in what is turning out to be the coldest morning in months.

ABC 7 notes that black ice was possible around Petaluma and Santa Rosa earlier in the day, and reminds us that when the temperature gets this low people should cover sensitive plants and make extra efforts to keep pets warm.

The frost advisory was in effect throughout the night until 9:00 a.m. this morning.

Thankfully, things are set to warm a bit this week, with the National Weather Service predicting a high of 66 degrees for both Friday and Saturday in San Francisco. But get your park day in quickly, as rain is expected for Sunday.

Warm Saturday news aside, this morning's chill caught at least one Bay Area resident by surprise.