An Arctic Air Mass brought the coldest temperatures that northeast Montana has seen in 3 years.  Wind chills with this cold air outbreak measured lower than -60 degrees in places.

Cold/Wind Chill in PETROLEUM, MONTANA
From 21-DEC-22 03:50:00 to 22-DEC-22 08:41:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

For multiple sites across Petroleum County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from early morning of the 21st into the morning of the 22nd. The peak wind chill of -47 was recorded at 3:50 PM and 4:50 PM on the 21st at the Winnett Handar mesonet site (GGWWT).

Cold/Wind Chill in EASTERN ROOSEVELT, MONTANA
From 21-DEC-22 03:14:00 to 23-DEC-22 11:04:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

For multiple sites across Eastern Roosevelt County, temperatures in the teens to 30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from early morning of the 21st into the late morning of the 23rd. The peak wind chill of -53 was recorded at 8:25 AM on the 23rd at the Big Sky Field Airport AWOS (KS85).

Cold/Wind Chill in GARFIELD, MONTANA
From 20-DEC-22 22:37:00 to 23-DEC-22 04:38:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

For multiple sites across Garfield County, temperatures in the teens to 30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from late night of the 20th into the early morning of the 23rd. The peak wind chill of -54 was recorded at 5:08 PM on the 21st and from 4:51 AM to 4:52 AM on the 22nd at the Luftborough Hill MT-200 DOT site (MTLUF).

Extreme Cold/Wind Chill in NORTHERN VALLEY, MONTANA
From 21-DEC-22 03:44:00 to 23-DEC-22 09:44:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

At the Bluff Creek RAWS site (BLUM8), temperatures in the teens to 30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from the early morning of the 21st into the morning of the 23rd. The peak wind chill of -56 was recorded at 7:44 AM on the 23rd.

Cold/Wind Chill in MCCONE, MONTANA
From 21-DEC-22 01:55:00 to 23-DEC-22 11:10:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

For multiple sites across McCone County, temperatures in the teens to 30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from early morning of the 21st into the late morning of the 23rd. The peak wind chill of -56 was recorded at 3:53 PM to 3:55 PM on the 21st at the Cow Creek MT-13 DOT site (MTCOW), and at 8:25 AM on the 23rd at the Circle Town County Airport AWOS (D0807).

Cold/Wind Chill in RICHLAND, MONTANA
From 21-DEC-22 06:15:00 to 23-DEC-22 06:10:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

For multiple sites across Richland County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from the morning of the 21st into the morning of the 23rd. The peak wind chill of -56 was recorded at 4:55 PM and 4:56 PM on the 21st at the Sidney-Richland Airport ASOS (KSDY).

Cold/Wind Chill in WIBAUX, MONTANA
From 21-DEC-22 02:30:00 to 23-DEC-22 10:49:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

For multiple sites across Wibaux County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from early morning of the 21st into the late morning of the 23rd. The peak wind chill of -58 was recorded from 4:15 PM to 5:15PM, again at 7:35PM, and again from 9:35 PM to 9:55 PM on the 21st at the Beach Airport ASOS (K20U).

Cold/Wind Chill in PRAIRIE, MONTANA
From 21-DEC-22 02:08:00 to 23-DEC-22 07:08:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

For multiple sites across Prairie County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from the morning of the 21st into the morning of the 23rd. The peak wind chill of -57 was recorded at 5:08 PM on the 21st at the Big Sheep Mountain RAWS site (LCFM8).

Cold/Wind Chill in DANIELS, MONTANA
From 21-DEC-22 03:00:00 to 23-DEC-22 07:01:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

For multiple sites across Daniels County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from the early morning of the 21st into the morning of the 23rd. The peak wind chill of -59 was recorded at 6:07 PM and 6:48 PM on the 21st and 3:00 AM on the 22nd at the Navajo MT-5 DOT site (MTRED).

Cold/Wind Chill in WESTERN ROOSEVELT, MONTANA
From 21-DEC-22 01:51:00 to 23-DEC-22 08:35:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

For multiple sites across Western Roosevelt County, temperatures in the teens to 30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from early morning of the 21st into the morning of the 23rd. The peak wind chill of -59 was recorded at 6:11 AM on the 29th at the McDonald's MT-13 DOT site (MTMCD).

Cold/Wind Chill in SHERIDAN, MONTANA
From 21-DEC-22 01:15:00 to 23-DEC-22 10:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

For multiple sites across Sheridan County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse beginning as early as the early morning of the 21st and lasting as long as the late morning of the 23rd. The peak wind chill of -61 was recorded at 7:01 PM and 7:36 PM on the 31st at the Comertown Turn-OFF MT-5 DOT site (MTCOM).

Cold/Wind Chill in DAWSON, MONTANA
From 21-DEC-22 02:24:00 to 23-DEC-22 07:54:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

For multiple sites across Dawspm County, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse beginning as early as the early morning of the 21st and lasting as long as the morning of the 23rd. The peak wind chill of -63 was recorded at 3:09 PM on the 21st at the Lindsay Divide MT-200 DOT site (MTLND).

Cold/Wind Chill in CENTRAL AND SOUTHERN VALLEY, MONTANA
From 21-DEC-22 03:30:00 to 23-DEC-22 14:25:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

For multiple sites across Central and Southern Valley County, temperatures in the teens to  30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from early morning of the 21st into the afternoon of the 23rd. The peak wind chill of -61 was recorded at 6:30 PM on the 21st at the Saint Marie MARCO site (07MT).

Cold/Wind Chill in CENTRAL AND SE PHILLIPS, MONTANA
From 19-DEC-22 12:00:00 to 23-DEC-22 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

For multiple sites across Central and Southeast Phillips County, temperatures in the teens to 30s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from midday on the 19th into midday of the 23rd. The peak wind chill of -72 was recorded at 11:00 AM on the 21st at the Malta Airnow mesonet site (A3570).

Cold/Wind Chill in LITTLE ROCKY MOUNTAINS, MONTANA
From 20-DEC-22 22:00:00 to 23-DEC-22 06:42:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

For multiple sites across the Little Rocky Mountains, temperatures in the teens and 20s below zero and breezy winds created intermittent periods of wind chills of -40 or worse from the late night of the 20th into the morning of the 23rd. The peak wind chill of -61 was recorded at 8:25 AM and 9:55 AM on the 21st at the FW7047 Landusky mesonet site (F7047).