An arctic cold front pushed into Montana the day after Christmas, bringing subzero temperatures and dangerous wind chills to the plains. Some areas also saw some snowfall as the cold air pushed into the area. Some gusty winds occurred as the cold air made a temporary retreat, with isolated high winds across the area.

Extreme Cold/Wind Chill in HILL, MONTANA
From 26-DEC-21 18:05:00 to 27-DEC-21 02:53:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple stations reported wind chills under -40. Coldest wind chill was a -48 wind chill recorded at a mesonet station 27 miles north of Havre at 2:46 am.

Extreme Cold/Wind Chill in SOUTHERN LEWIS AND CLARK, MONTANA
From 27-DEC-21 08:37:00 to 27-DEC-21 08:37:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Bowmans Corner mesonet site records a wind chill of -41.

Extreme Cold/Wind Chill in LIBERTY, MONTANA
From 26-DEC-21 22:30:00 to 26-DEC-21 22:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet stations around Joplin recorded wind chills around -45.

Extreme Cold/Wind Chill in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 26-DEC-21 21:58:00 to 27-DEC-21 08:40:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple sensors across the Southern Rocky Mountain Front recorded wind chills between -40 and -44.

Extreme Cold/Wind Chill in CHOUTEAU, MONTANA
From 26-DEC-21 23:53:00 to 26-DEC-21 23:53:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station near Big Sandy recorded a wind gust of -43. Only report in the county.

Extreme Cold/Wind Chill in FERGUS, MONTANA
From 26-DEC-21 09:00:00 to 26-DEC-21 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

AWOS station Oscar records wind chill of -47.

Extreme Cold/Wind Chill in JUDITH BASIN, MONTANA
From 26-DEC-21 23:30:00 to 27-DEC-21 01:06:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Two mesonet stations, at Geyser and Benchland, report wind chills between -40 and -42.

Extreme Cold/Wind Chill in EASTERN PONDERA, MONTANA
From 27-DEC-21 00:00:00 to 27-DEC-21 00:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station 6 miles WNW of Ledger reports wind chill of -40.

Extreme Cold/Wind Chill in EASTERN GLACIER, MONTANA
From 26-DEC-21 09:00:00 to 26-DEC-21 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cut Bank airport reports wind chill of -41.

Extreme Cold/Wind Chill in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 27-DEC-21 07:54:00 to 27-DEC-21 07:54:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Meosnet station at Two Medicine Bridge recorded a wind chill of -40.

Extreme Cold/Wind Chill in BLAINE, MONTANA
From 27-DEC-21 02:40:00 to 27-DEC-21 02:40:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Awos station s719 chinook reports a wind chill of -45.

High Wind in MADISON, MONTANA
From 30-DEC-21 06:27:00 to 30-DEC-21 06:27:00 (MST-7)
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station at Norris Hill recorded a wind gust of 60 mph. This appears to have been an isolated report, with nearby stations recording wind gusts to around 50 mph.

High Wind in EASTERN GLACIER, MONTANA
From 29-DEC-21 22:19:00 to 29-DEC-21 22:19:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cut Bank ASOS recorded a wind gust to 59 mph. This appears to have been an isolated gust in the area.

Extreme Cold/Wind Chill in TOOLE, MONTANA
From 26-DEC-21 15:00:00 to 27-DEC-21 12:21:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple mesonet stations recorded wind chills between -40 and -50, with the coldest reading of -50 occurring 11 SSW of Whitlash at 12:21 pm on the 27th.

Heavy Snow in GALLATIN, MONTANA
From 26-DEC-21 07:30:00 to 26-DEC-21 12:11:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Total snowfall of 6 inches since 730 am mst.