The combination of an Arctic air mass, a clear sky, light wind, and deep snowpack brought record cold temperatures to most of western and central Wyoming. Most of the coldest temperatures occurred in the snow covered basins where low temperatures of minus 30 were commonplace with some areas seeing low temperatures less than 40 below zero. The coldest temperature in the forecast area occurred in Yellowstone Park where Grant Village feel to minus 47 degrees on the morning of January 30th. Wind chills were in the 30 to 40 below range for most basins.

Extreme Cold/Wind Chill in YELLOWSTONE NATIONAL PARK, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures under 30 below zero were common. Some of the coldest temperatures included minus 47 at Grant Village and 44 below at the Thumb Divide SNOTEL site.

Extreme Cold/Wind Chill in NORTH BIG HORN BASIN, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Low temperatures fell below minus 30 in several locations, including minus 34 at the Greybull Airport and minus 34 in downtown Greybull.

Extreme Cold/Wind Chill in SOUTHWEST BIG HORN BASIN, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures at Thermopolis and Kirby dropped to 30 below zero.

Extreme Cold/Wind Chill in SOUTHEAST BIG HORN BASIN, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Many locations had low temperatures below minus 30. Some of the coldest temperatures included minus 35 at the Worland Airport and minus 32 at Ten Sleep.

Extreme Cold/Wind Chill in BIGHORN MOUNTAINS SOUTHEAST, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The Cloud Peak SNOTEL site had a low temperature of minus 37 on the morning of January 30th.

Extreme Cold/Wind Chill in JACKSON HOLE, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures in the minus 20s were common in the Jackson Valley. Some of the coldest temperatures included minus 31 at Moran and minus 32 at the Jackson Dam.

Extreme Cold/Wind Chill in UPPER WIND RIVER BASIN, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures fell to under 30 below zero in many locations, including minus 34 near Crowheart and minus 30 near Dubois.

Extreme Cold/Wind Chill in WIND RIVER BASIN, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Very cold temperatures occurred in the Wind River Basin, with the coldest temperatures in the lowest elevations. The coldest temperature reported was minus 41 near Hudson. Many other locations had low temperatures under minus 30 including minus 38 at Shoshoni and minus 38 in Riverton.

Extreme Cold/Wind Chill in GREEN MOUNTAINS & RATTLESNAKE RANGE, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Very cold temperatures occurred in the Green and Rattlesnake Mountains. The coldest temperature reported was minus 34 at Jeffrey City.

Extreme Cold/Wind Chill in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures in the minus 20s were common in Natrona County. The lowest temperature reported was minus 29 along Hat Six Road on the east side of Casper. Wind chills ranged from 30 to 40 below zero.

Extreme Cold/Wind Chill in UPPER GREEN RIVER BASIN FOOTHILLS, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures under 30 below zero were common through this period, including minus 40 north of Daniel and 37 near Daniel.

Extreme Cold/Wind Chill in UPPER GREEN RIVER BASIN, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Many locations recorded low temperatures under 25 below zero. The lowest temperature recorded was 38 below zero at Farson.

Extreme Cold/Wind Chill in SOUTH LINCOLN COUNTY, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Many locations had low temperatures under 30 below zero. The lowest temperature recorded was 37 below zero near Cokeville and La Barge.

Extreme Cold/Wind Chill in EAST SWEETWATER COUNTY, WYOMING
From 29-JAN-23 21:00:00 to 31-JAN-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Low temperatures under minus 20 were common across Eastern Sweetwater County. The lowest temperature recorded was minus 31 at Point of Rocks along Interstate 80.