Dreaming of a white Christmas in SLO County? Here’s what experts say about chances of snow
Do you dream of waking up to a snowy Christmas morning in San Luis Obispo County?
Imagine opening presents as snowflakes stick to the windowpanes and icicles dangle from your roof.
This kind of winter wonderland is relatively common on the East Coast, in the Midwest and even parts of California at higher elevations.
Has SLO County ever had a white Christmas? Is it even possible for the area to see snow on Dec. 25?
The Tribune reached out to weather experts to discover the answer.
Has it ever snowed on Christmas Day in SLO County?
The short answer is “no,” according to John Lindsey, a retired PG&E marine meteorologist
“We’ve definitely had snow flurries here in San Luis (Obispo in December),” he said. “But as far as official records, nothing that ever stuck to the ground.”
The National Weather Service defines a white Christmas as at least 1 inch of snow on the ground on the morning of Dec. 25.
According to Lindsey, SLO County came relatively close to a white Christmas on Dec. 15, 1988, when a powerful storm swept into Central California.
The weather event closed Highway 101 at the Cuesta Grade north of San Luis Obispo, shutting down schools and stranding travelers.
The North County saw record amounts of snow, ranging from 5 to 8 inches, with Santa Margarita receiving a whopping 7 inches.
“It looked like a winter wonderland in the North County on that day,” Lindsey wrote in his column for The Tribune in 2019.
Is a white Christmas possible in SLO County in 2024?
Could SLO County see a white Christmas this year?
“Probably not,” said Ryan Kittell, a meteorologist at the National Weather Service.
As of Tuesday, there was a 70% to 80% chance of rain across the county, either on Christmas Eve, Tuesday, Dec. 24, or Christmas Day, Wednesday, Dec. 25, Kittell said.
“The (precipitation) amounts don’t look very high, so if you’re looking for a lot of rain, the chances are pretty slim,” he said, but there’s a growing chance of at least a little rain.
If the storm does materialize, it may drop some snow in areas at elevations above 1,000 feet, Kittell said.
“At least at this point, it doesn’t look like much snow for where anyone might live,” he said.
Why is holiday snowfall less likely in SLO County?
According to Lindsey, a few climate factors make snow unlikely in SLO County during the holiday season.
Winter is usually too mild in the region due to its proximity to the Pacific Ocean, Lindsey said, with temperatures rarely dropping below freezing.
Throughout the winter months, the ocean keeps the Central Coast warmer, while during the summer, it cools the area down, Lindsey said.
“There’s just too much marine influence here,” he explained.
According to Lindsey, for snow to fall, the county would need a weather system that brings a wave of cold air down to the surface.
Even though there is a storm front arriving in SLO County on Christmas Eve with some rain, “Temperatures will be on the mild side,” he said.
December also tends to be fairly dry compared to the rest of the winter months, which means there’s less precipitation available to transform into white fluffy flakes.
On average, Cal Poly recorded 4.01 inches of rain in December from 1893 to 2016, Western Regional Climate Center data showed, compared to an average of 4.96 inches in January.
During roughly the same time period, Paso Robles received an average of 2.56 inches of rain in December and 3.46 inches of rain on average in January, the center said.
When has SLO County gotten significant snow?
According to Tribune archives, snow has been spotted on the Central Coast several times over the past century or so.
In 1910, the area experienced what the San Luis Obispo Tribune described as the “heaviest snow storm since 1885.”
Photos from 1922 show snow on the ground in Monterey Street in downtown San Luis Obispo.
In February 1944, local residents drove up the Cuesta Grade to have a snowball fight, Tribune photographer David Middlecamp wrote in a 2019 “Photos from the Vault” column
Shandon got almost 4 inches of snow in December 1967, when chains were required to drive between Morro Bay and Atascadero, Middlecamp said.
In March 1976, a storm topped local hillsides with snow, closing the Cuesta Grade to Highway 101 traffic and forcing the Goodyear blimp to land at the San Luis Obispo County Regional Airport.
Snow also closed the Cuesta Grade in March 1991.
In February 2019, a chilly low-pressure system led to low snow levels throughout the Central Coast.
Most recently in 2023, a storm dropped snow across the higher elevations of SLO County in February, dusting vineyards in Paso Robles, frosting fields off Highway 58 and providing a dramatic backdrop for surfers competing in the SLO CAL Open in Morro Bay.
Caltrans closed parts of Highway 41 and Highway 58 due to the wintry weather.
What are the weather conditions needed to produce snow?
An atypical combination of weather conditions have to occur to cause snowfall in SLO County, according to Lindsey.
First, a strong upper-level, low pressure system must travel from Canada down to the Pacific Northwest and through the Central Coast, he said.
“The only chance you’ve got is when there’s the upper-level low (system) that’s dragging down a bunch of cold air from the upper atmosphere down to the surface,” he said. “That’s when you got a chance for snow around here. If that doesn’t really happen, you’re just going to get rain.”
February is the most likely month for snow to appear in SLO County, according to Kittell.
Cold fronts appear most frequently at the beginning of the year, in January and February.
“That’s usually when we get our lowest temperatures overall, and the coldest air mass is moving through here,” he said.
Where are you most likely to see snow on the Central Coast?
According to Lindsey, snow falls at higher elevations on the Central Coast.
The highest elevation in San Luis Obispo County is Caliente Mountain northwest of New Cuyama at 5,106 feet. In Santa Barbara County, the highest elevation is Big Pine Mountain at 6,828 feet.
Local roads that offer the best views of snow include Highway 58 east of the California Valley, which has a summit of 3,528 feet, and Highway 166, which summits at Reyes Station at 2,968 feet.
Highway 33 crests at 5,000 feet near Pine Mountain leading into Los Padres National Forest.
You could see snow on Highway 101 at the Cuesta Grade at 1,522 feet, Lindsey said, but you have a better chance on Highway 46 on the Antelope Grade at 1,765 feet.
