A very cold airmass pushed into Western Washington at the end of December, resulting in cold air amidst sufficient moisture and lift as a modified arctic frontal boundary slid south. This made for significant lowland and mountain snow, with a period of drier but much colder weather for the following days. Several climate sites reached record low temperatures during and shortly after the winter storm.

Cold/Wind Chill in CENTRAL COAST, WASHINGTON
From 28-DEC-21 00:00:00 to 28-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low was reported at the Hoquiam ASOS on the morning of Dec 28th at 21F. This replaces the previous record low temperature of 25F from 1978.

Heavy Snow in WESTERN WHATCOM COUNTY, WASHINGTON
From 25-DEC-21 12:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A winter storm brought heavy snow to Western Whatcom County around the Christmas holiday. Reports generally ranged from 8 to 15 inches.

Heavy Snow in WESTERN SKAGIT COUNTY, WASHINGTON
From 25-DEC-21 12:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

Heavy snow affected much of Western Skagit County during the final week of December. New snow accumulations generally ranged from 6 to 12 inches.

Heavy Snow in SAN JUAN, WASHINGTON
From 25-DEC-21 12:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm affected most of the San Juan Islands during the final week of December. Reports from the Islands generally ranged from 3 to 6 inches.

Heavy Snow in EASTERN STRAIT OF JUAN DE FUCA, WASHINGTON
From 25-DEC-21 12:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm brought heavy snow to the northern side of the Olympic Peninsula during the last week of December. Snow was orographically enhanced, resulting in an average of 10-20 inches for locations along the East Strait of Juan de Fuca, with most of the 20 inch reports located just south of Port Angeles.

Heavy Snow in EVERETT AND VICINITY, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm affected the Everett area right after the Christmas holiday as modified arctic air pushed into the area. Average snow totals ranged from 5 to 7 inches.

Heavy Snow in NORTH COAST, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm affected the North Coast of Washington during the final week of December. Average snowfall totals were around 4 inches.

Heavy Snow in CENTRAL COAST, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm affected the Central WA Coast just after the Christmas holiday. Average snowfall totals ranged generally from 3 to 6 inches, although isolated higher amounts around 9 inches were noted.

Heavy Snow in HOOD CANAL AREA, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm brought an average of 6 to 12 inches of new snow to the Hood Canal area during the final week of December.

Heavy Snow in SOUTHWEST INTERIOR, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm brought heavy snow to the Southwest Interior during the last week of December as a modified arctic airmass moved in. An average of 5 to 10 inches was reported after the storm across the area.

Heavy Snow in TACOMA AREA, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm during the final week of December resulted in an average of 4 to 6 inches across the Tacoma area.

Heavy Snow in BREMERTON AND VICINITY, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A late December Winter Storm brought an average of 3 to 5 inches to the Bremerton area as a modified arctic front pushed across the area.

Heavy Snow in SEATTLE AND VICINITY, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm brought heavy snow to the Seattle area during the last week of December as a modified arctic frontal boundary pushed across the area. The Seattle metro area received an average of 4 to 6 inches of snowfall.

Heavy Snow in BELLEVUE AND VICINITY, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm during the last week of December resulted in an average snowfall total of 4 to 6 inches across the Bremerton area.

Heavy Snow in LOWER CHEHALIS VALLEY AREA, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A winter storm brought heavy snow to the Lower Chehalis Valley Area, resulting in generally 8-12 inches of new snow accumulation.

Heavy Snow in ADMIRALTY INLET AREA, WASHINGTON
From 26-DEC-21 00:00:00 to 27-DEC-21 07:00:00 (PST-8)
Reported by: CoCoRaHS

A Winter Storm brought heavy snow to the Admiralty Inlet Area, including Whidbey Island and Camano Island. Snowfall totals in this area generally ranged from 3-8 inches, with isolated higher amounts towards 10 inches, especially the northern portion of Whidbey Island.

High Wind in WESTERN WHATCOM COUNTY, WASHINGTON
From 26-DEC-21 00:00:00 to 26-DEC-21 12:00:00 (PST-8)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Amidst strong Fraser Outflow, the ASOS at the Bellingham. Airport measured a wind gust of 63 mph around 0730 local time.

Cold/Wind Chill in WESTERN WHATCOM COUNTY, WASHINGTON
From 26-DEC-21 00:00:00 to 26-DEC-21 08:00:00 (PST-8)
Reported by: ASOS

With Western Whatcom experiencing the strongest Fraser Outflow at the beginning of the winter storm event, a record low temperature was set at Bellingham of 11F, which replaces the old record of 12F set in 1971.

Cold/Wind Chill in NORTH COAST, WASHINGTON
From 27-DEC-21 00:00:00 to 27-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low was reported at the Quillayute ASOS on the morning of Dec 27th at 19F. This replaces the previous record low temperature of 23 from 1978.

Cold/Wind Chill in WESTERN WHATCOM COUNTY, WASHINGTON
From 27-DEC-21 00:00:00 to 27-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low was reported at the Bellingham ASOS on the morning of Dec 27th at 9F. This replaces the previous record low temperature of 12 from 1971.

Cold/Wind Chill in CENTRAL COAST, WASHINGTON
From 27-DEC-21 00:00:00 to 27-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low was reported at the Hoquiam ASOS on the morning of Dec 27th at 25F. This replaces the previous record low temperature of 26 from 1954.

Cold/Wind Chill in SEATTLE AND VICINITY, WASHINGTON
From 27-DEC-21 00:00:00 to 27-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low was reported at the SeaTac ASOS on the morning of Dec 27th at 20F. This replaces the previous record low temperature of 22 from 1948.

Cold/Wind Chill in SEATTLE AND VICINITY, WASHINGTON
From 28-DEC-21 00:00:00 to 28-DEC-21 08:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low was reported at the SeaTac ASOS on the morning of Dec 28th at 17F. This replaces the previous record low temperature of 20F from 1968.