A powerful arctic outbreak brought some of the coldest temperatures to northeast Colorado in nearly 30 years.  The arctic outbreak impacted the Rockies, the Midwest, Northeast, and Southern United States. Denver dropped to -24F, one-degree shy of the all-time December record of -25F set back in 1990.  There was also a 75-degree drop, one-degree shy of the all-time 2-day record temperature differential.  Across north-central and northeast Colorado, wind chill temperatures ranged from -25F to -54F.  In the city of Denver, there was one confirmed fatality.
Denver opened up several more warming shelters. Power outages impacted up to 6400 customers in the I-25 Corridor.  Numerous school districts and county government buildings were closed on the 22nd.  At Denver International Airport,  645 flights were canceled and another 922 were delayed on the 22nd.  The following day, 264 flights were canceled and 253 flights were delayed.  Denver firefighters responded to hundreds of calls related to burst pipes in buildings and homes following the arctic freeze.  Ten buildings on the University of Colorado Boulder campus were impacted by a power interruption, which resulted in widespread damage that included flooding from burst pipes.  At the Dave Skaggs Research Center, extensive water damage occurred from burst pipes.
Portions of I-25, CO 14, US 287, and US 85 were closed due to squalls and blowing snow near the Wyoming border.  Other closures included:  CO 14 from Highway 85 to Sterling, US 6 Sterling to Nebraska state line, CO 113 Highway 138 to Nebraska state line, CO 59 I-76 to Yuma, CO 61 I-76 to Otis, CO 385 Julesburg to Holyoke.  Storm totals in the mountains and foothills ranged from 4 to 13 inches, highest at Eldora Ski Area.  Across the urban corridor and northeast plains, storm totals ranged from 3 to 9 inches.  At Denver International Airport, 3.9 inches of snowfall was observed, with 6.0 inches at the National Weather Service Office in Boulder.

Cold/Wind Chill in S & E JACKSON / LARIMER / N & NE GRAND / NW BOULDER COUNTIES ABOVE 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -45F.

Cold/Wind Chill in LARIMER & BOULDER COUNTIES BETWEEN 6000 & 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -51F.

Cold/Wind Chill in C & S WELD COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -42F.

Cold/Wind Chill in C & SE PARK COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -30F to -35F.

Cold/Wind Chill in JEFFERSON & W DOUGLAS COUNTIES ABOVE 6000 FEET / GILPIN / CLEAR CREEK / NE PARK COUNTIES BELOW 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -36F.

Cold/Wind Chill in MORGAN COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -35F to -49F.

Winter Weather in JEFFERSON & W DOUGLAS COUNTIES ABOVE 6000 FEET / GILPIN / CLEAR CREEK / NE PARK COUNTIES BELOW 9000 FEET, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in LARIMER COUNTY BELOW 6000 FEET / NW WELD COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -40F.

Cold/Wind Chill in C & E ADAMS & ARAPAHOE COUNTIES, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -26F to -40F.

Winter Weather in LARIMER COUNTY BELOW 6000 FEET / NW WELD COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in C & S WELD COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in S & SE GRAND / W CENTRAL & SW BOULDER / GILPIN / CLEAR CREEK / SUMMIT / N & W PARK COUNTIES ABOVE 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -54F.

Cold/Wind Chill in N & NE ELBERT COUNTY BELOW 6000 FEET / N LINCOLN COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -47F.

Winter Weather in S & E JACKSON / LARIMER / N & NE GRAND / NW BOULDER COUNTIES ABOVE 9000 FEET, COLORADO
From 21-DEC-22 12:00:00 to 22-DEC-22 06:00:00 (MST-7)
Reported by: SNOTEL

Winter Weather in MORGAN COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in JACKSON COUNTY BELOW 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -26F to -42F.

Cold/Wind Chill in BOULDER & JEFFERSON COUNTIES BELOW 6000 FEET / W BROOMFIELD COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -34F.

Cold/Wind Chill in SE ELBERT COUNTY BELOW 6000 FEET / SOUTH LINCOLN COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -37F.

Winter Weather in S & SE GRAND / W CENTRAL & SW BOULDER / GILPIN / CLEAR CREEK / SUMMIT / N & W PARK COUNTIES ABOVE 9000 FEET, COLORADO
From 21-DEC-22 12:00:00 to 22-DEC-22 06:00:00 (MST-7)
Reported by: SNOTEL

Winter Weather in C & E ADAMS & ARAPAHOE COUNTIES, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in WEST JACKSON & WEST GRAND COUNTIES ABOVE 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -42F.

Cold/Wind Chill in GRAND & SUMMIT COUNTIES BELOW 9000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -40F.

Cold/Wind Chill in N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -40F.  According to the city of Denver, at least one person died from exposure to the dangerously cold temperatures.

Cold/Wind Chill in LOGAN COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -39F to -51F.

Winter Weather in BOULDER & JEFFERSON COUNTIES BELOW 6000 FEET / W BROOMFIELD COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in N & NE ELBERT COUNTY BELOW 6000 FEET / N LINCOLN COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in ELBERT / C & E DOUGLAS COUNTIES ABOVE 6000 FEET, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -40F.

Cold/Wind Chill in WASHINGTON COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -35F to -49F.

Winter Weather in N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in SE ELBERT COUNTY BELOW 6000 FEET / SOUTH LINCOLN COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in NE WELD COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -25F to -45F.

Cold/Wind Chill in SEDGWICK COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -45F to -54F.

Winter Weather in JACKSON COUNTY BELOW 9000 FEET, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in LOGAN COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Cold/Wind Chill in PHILLIPS COUNTY, COLORADO
From 21-DEC-22 20:00:00 to 23-DEC-22 11:00:00 (MST-7)
Reported by: Mesonet

Wind chill temperatures ranged from -40F to -49F.

Winter Weather in GRAND & SUMMIT COUNTIES BELOW 9000 FEET, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in WASHINGTON COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in LARIMER & BOULDER COUNTIES BETWEEN 6000 & 9000 FEET, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in ELBERT / C & E DOUGLAS COUNTIES ABOVE 6000 FEET, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in SEDGWICK COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in NE WELD COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in PHILLIPS COUNTY, COLORADO
From 21-DEC-22 16:00:00 to 22-DEC-22 09:00:00 (MST-7)
Reported by: Mesonet

Winter Weather in WEST JACKSON & WEST GRAND COUNTIES ABOVE 9000 FEET, COLORADO
From 21-DEC-22 12:00:00 to 22-DEC-22 06:00:00 (MST-7)
Reported by: SNOTEL