During the first week of February, an Arctic air mass moved southward across the Upper Midwest and continued through the middle of the month. The core of the cold air remained centered across south-central Canada before slowly weakening and moving off to the east after the weekend of February 13th and 14th. Several days of well below normal temperatures combined with subtle wind speeds, generated periods of wind chill values below -30F around Rice Lake and Ladysmith. The bulk of the lowest wind chills, when combined with temperatures dropping to around -20F to -25F, were Sunday morning, February 14th. Due to the terrain, and more sheltering from the higher winds speeds in the valleys, wind chill values of -35F or lower occurred a few hours either side of sunrise. The lowest wind chill occurred at Cumberland airport where a reading of -46 was recorded at 0735 LST.
A secondary surge of low wind chill values occurred late Sunday and into Monday morning February 15th, especially across west-central Wisconsin where wind speeds were slightly higher based on the tighter pressure gradient. Actual temperatures were much lower and winds were lighter. However, even a slight 5 to 8 mph wind speed caused wind chill values to drop below -35F for several hours.
Wind chill values were obtained from ASOS, AWOS, RAWS, and other private weather wind sensors throughout west-central Wisconsin.
The following are some of the lowest wind chill values during the height of the cold snap:
-47F at Cumberland, Wisconsin.
-44F at Woodville, Wisconsin.
-43F at Menomonie, Wisconsin.

Extreme Cold/Wind Chill in BARRON, WISCONSIN
From 14-FEB-21 01:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -46F occurred near Cumberland at 0730 LST.

Extreme Cold/Wind Chill in DUNN, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 09:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -36F occurred near Menomonie at 0900 LST.

Extreme Cold/Wind Chill in PIERCE, WISCONSIN
From 14-FEB-21 01:00:00 to 14-FEB-21 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -42F occurred near Ellsworth at 0700 LST.

Extreme Cold/Wind Chill in RUSK, WISCONSIN
From 14-FEB-21 03:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -38F occurred near Ladysmith at 0630 LST.

Extreme Cold/Wind Chill in ST. CROIX, WISCONSIN
From 14-FEB-21 01:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -44F occurred near Woodville at 0915 LST.

Extreme Cold/Wind Chill in BARRON, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -47F occurred near Cumberland at 0500 LST.

Extreme Cold/Wind Chill in CHIPPEWA, WISCONSIN
From 14-FEB-21 03:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -37F occurred near Eau Claire at 0900 LST.

Extreme Cold/Wind Chill in EAU CLAIRE, WISCONSIN
From 14-FEB-21 03:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -41F occurred near Eau Claire at 0900 LST.

Extreme Cold/Wind Chill in PIERCE, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -38F occurred near Ellsworth at 0300 LST.

Extreme Cold/Wind Chill in RUSK, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -49F occurred near Ladysmith at 0315 LST.

Extreme Cold/Wind Chill in ST. CROIX, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWSS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -39F occurred near Woodville at 0400 LST.

Extreme Cold/Wind Chill in CHIPPEWA, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -35F occurred for a few hours across the county.

Extreme Cold/Wind Chill in EAU CLAIRE, WISCONSIN
From 15-FEB-21 00:00:00 to 15-FEB-21 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -37F occurred near Eau Claire at 0800 LST.

Extreme Cold/Wind Chill in DUNN, WISCONSIN
From 14-FEB-21 02:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -43F occurred near Menomonie at 0900 LST.

Extreme Cold/Wind Chill in PEPIN, WISCONSIN
From 14-FEB-21 02:00:00 to 14-FEB-21 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -38F occurred near Ganoe Hill at 0700 LST.

Extreme Cold/Wind Chill in POLK, WISCONSIN
From 14-FEB-21 01:00:00 to 14-FEB-21 11:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Several sources of weather sensors provided wind chill values during this prolonged cold snap. The lowest wind chill value of -38F occurred near Osceola at 0830 LST.