An extended period of snow fell across northeast Iowa from December 16th into the 17th. Accumulations generally ranged from 4 to 7 inches. As the snow was ending, northwest winds increased into the 15 to 25 mph ranged that produced plenty of drifting snow along with some visibility reductions from blowing snow. The highest reported snowfall amount was 7 inches in St. Ansgar (Mitchell County). Once the snow ended, cold air poured into the region and when combined with the winds, produced dangerously cold wind chills. Values of 25 to 40 below zero were common on the morning of the 18th.

Winter Storm in FLOYD, IOWA
From 16-DEC-16 10:00:00 to 17-DEC-16 14:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

COOP and volunteer snow observers reported that 4 to 6 inches of snow fell across Floyd County. As the snow was ending on the 17th, northwest winds increased to 15 to 25 mph and produced drifting snow and some visibility reductions from blowing snow.

Winter Storm in MITCHELL, IOWA
From 16-DEC-16 10:00:00 to 17-DEC-16 13:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

COOP and volunteer snow observers reported that 5 to 7 inches of snow fell across Mitchell County. The highest reported amount was 7 inches in St. Ansgar. As the snow was ending on the 17th, northwest winds increased to 15 to 25 mph and produced drifting snow and some visibility reductions from blowing snow.

Extreme Cold/Wind Chill in CHICKASAW, IOWA
From 18-DEC-16 02:25:00 to 18-DEC-16 09:45:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill values of 30 to 40 below zero were common across Chickasaw County during the morning of December 18th. The coldest reported value was 38 below from a mesonet reporting station in New Hampton.

Extreme Cold/Wind Chill in CLAYTON, IOWA
From 18-DEC-16 02:35:00 to 18-DEC-16 08:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chill values of 30 to 40 below zero were common across Clayton County during the morning of December 18th. The coldest reported value was 40 below from a mesonet reporting station in Monona.

Extreme Cold/Wind Chill in FAYETTE, IOWA
From 18-DEC-16 02:35:00 to 18-DEC-16 08:55:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chill values of 30 to 40 below zero were common across Fayette County during the morning of December 18th. The coldest reported value was 42 below from a mesonet reporting station near Arlington and the automated weather observing equipment at the Oelwein airport.

Extreme Cold/Wind Chill in FLOYD, IOWA
From 18-DEC-16 02:15:00 to 18-DEC-16 10:35:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Wind chills of 30 to 40 below zero were common across Floyd County during the morning of December 18th. The coldest reported value was 42 below from the automated weather observing equipment at the Charles City airport.

Extreme Cold/Wind Chill in HOWARD, IOWA
From 18-DEC-16 01:50:00 to 18-DEC-16 09:30:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills of 30 to 40 below zero were common across Howard County during the morning of December 18th.

Extreme Cold/Wind Chill in MITCHELL, IOWA
From 18-DEC-16 00:35:00 to 18-DEC-16 08:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills of 30 to 40 below zero were common across Mitchell County during the morning of December 18th.

Extreme Cold/Wind Chill in WINNESHIEK, IOWA
From 18-DEC-16 01:55:00 to 18-DEC-16 09:15:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind chills of 30 to 40 below zero were common across Winneshiek County during the morning of December 18th. The coldest reported value was 38 below from a mesonet reporting station near Jackson Junction.