Remember when the mercury hit a sweltering and record 84 degrees?

That was five days ago.

On Sunday morning, temperatures hit 30 degrees or less in parts of Sonoma County, bringing the first taste of winter weather, but it's only fall. About 2 feet of snow fell in the Sierra.

"Those Canadians brought down some cold air," National Weather Service meteorologist Steve Anderson said. "They wanted to share what it's like to be in Canada."

Temperatures reached their coldest point shortly after sunrise at about 7 a.m. of 30 degrees in parts of Petaluma and at the Charles M. Schulz-Sonoma County Airport and 31 in Guerneville, Anderson said.

Volunteer weather watchers noted brisk morning temperatures and frost, including a report from Monte Rio that called morning conditions the "first big freeze of the year . . . lots of white roofs."

A volunteer in Rohnert Park reported 29 degrees at 7 a.m. Cazadero and Middletown reported lows of 28.

Santa Rosa's official low Sunday was 32 degrees, shy of the record for Nov. 11 of 25 degrees in 1935.

Forecasters said the coldest recorded spot in the North Bay was Pope Valley in northern Napa County at 25 degrees.

After chilly overnight temperatures, much of Sonoma County was expected to warm to the low 60s today and for the rest of the week. Lows in the 40s are forecast. Santa Rosa's average temperatures for Nov. 11 is 69 and 44.

A chance of a passing shower is possible Tuesday and again Thursday, forecasters said.

A storm dumped about 2 feet of snow in the Tahoe region over the weekend, said Zach Tolby, a meteorologist based in Reno.

On Friday and Saturday, a total of 28 inches fell near the Alpine Meadows ski resort, 24 inches in Squaw Valley and 18 inches in the Truckee and Tahoe Donner areas, Tolby said. Truckee on Sunday reported a high of 36 and a low of minus 2.

Are skiers excited about the first major snow?

"We don't really measure that," Tolby said.

Boreal and Mammoth Mountain ski resorts are open, and Northstar and Heavenly are scheduled to open Friday, weather permitting.

Squaw Valley opens Nov. 21 and Alpine and Tahoe Donner are scheduled to open Dec. 7, according to the resorts' websites.You can reach Staff Writer Julie Johnson at 521-5220, or on Twitter @jjpressdem.