The passage of a Canadian cold front brought extremely cold wind chill temperatures overnight on the 22nd into the daytime on the 23rd.   Henry's Lake recorded the coldest wind chill temperature at 46 below zero at 730 AM on the 23rd.

Extreme Cold/Wind Chill in CENTENNIAL MOUNTAINS-ISLAND PARK, IDAHO
From 22-FEB-22 18:00:00 to 23-FEB-22 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Extreme cold wind chill readings occurred behind a cold frontal passage.   Coldest readings on the 23rd were -46 at Henry's Lake at 730 AM, -35 near Spencer at 112 AM, and 033 at Osborne Bridge at 445 AM.  Island Park recorded -30 at 654 AM.

Cold/Wind Chill in LOST RIVER VALLEYS, IDAHO
From 22-FEB-22 18:00:00 to 23-FEB-22 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Very cold wind chill readings of -25 to -30 were widespread with the coldest -30 at Dead Man Canyon at 725 AM.

Cold/Wind Chill in RAFT RIVER REGION, IDAHO
From 22-FEB-22 20:00:00 to 23-FEB-22 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Extremely cold wind chill readings occurred overnight on the 22nd into the 23rd.   Moburg Canyon recorded -30 at 839 AM and Juniper Interchange recorded -25 at 800 AM on the 23rd.

Cold/Wind Chill in ARCO-MUD LAKE DESERT, IDAHO
From 22-FEB-22 21:00:00 to 23-FEB-22 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill values in the -25 to -35 range occurred with the coldest a -34 degree reading 6 miles north of Monteview at 725 AM on the 23rd.

Extreme Cold/Wind Chill in BEAVERHEAD-LEMHI HIGHLANDS, IDAHO
From 22-FEB-22 18:00:00 to 23-FEB-22 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Extreme cold wind chills followed the passage of a Canadian cold front.   -40 degrees or colder were common by the morning of the 23rd.    The coldest were -48 at Monida at 645 AM and -48 at China Point at 815 AM.  Both of these sites were Idaho Transportation Department sites on interstate 15.

Extreme Cold/Wind Chill in SAWTOOTH-STANLEY BASIN, IDAHO
From 22-FEB-22 19:00:00 to 23-FEB-22 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An extremely strong Canadian cold front brought wind chill readings of -37 at the Smiley Creek Airport at 800 AM on the 23rd and -27 at the Stanley Airport at 0751 AM on the 23rd.

Cold/Wind Chill in TETON VALLEY, IDAHO
From 22-FEB-22 20:00:00 to 23-FEB-22 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill readings of -20 to -30 occurred in the Teton Valley behind a strong Canadian cold front.   -29 was the coldest reading on the 23rd in Ashton at 0700 AM.  Botts recorded -27 at 430 AM and River Rim -25 at 0400 AM.

Cold/Wind Chill in UPPER SNAKE RIVER PLAIN, IDAHO
From 22-FEB-22 20:00:00 to 23-FEB-22 13:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread -20 to -35 wind chill readings occurred overnight on the 22nd into the 23rd.   The coldest on the 23rd were:  -33 at Kettle Butte at 0715 AM, -30 at Roberts at 0200 AM, and -30 at Sage Junction at 0645 AM.   The Idaho Falls Regional Airport recorded -21 at 0553 AM.