Very cold arctic air, a recent fresh snow cover, and clearing skies all contributed to the coldest temperatures of the season, and the coldest wind chill values for portions of northeast Montana.

Cold/Wind Chill in CENTRAL AND SE PHILLIPS, MONTANA
From 08-FEB-19 04:15:00 to 08-FEB-19 12:55:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

With temperatures of -15 to -31 and wind speeds of 9 to 18 mph, wind chill values near and colder than -40 were common. The coldest wind chill value of -53 was recorded at 4:15 AM at the Malta airport ASOS site.

Cold/Wind Chill in CENTRAL AND SOUTHERN VALLEY, MONTANA
From 07-FEB-19 20:53:00 to 08-FEB-19 11:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Combining observations from both Frazer and Glasgow, temperatures in the -20s and wind speeds from 9 to 17 mph combined to create wind chill values in the -40s and -50s in central Valley County.  The coldest wind chill value of -55 was recorded at 12:53 AM at the Glasgow airport ASOS site.

Cold/Wind Chill in DANIELS, MONTANA
From 07-FEB-19 04:31:00 to 07-FEB-19 10:04:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

With temperatures of -20 and below and wind speeds of 9 to 14 mph, wind chill values in the -40s were common across Daniels County.  The coldest wind chill value of -47 was recorded at the Navajo MT-5 DOT site at 7:16 AM.

Cold/Wind Chill in SHERIDAN, MONTANA
From 07-FEB-19 03:42:00 to 07-FEB-19 10:22:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

With temperatures in the -10s and -20s, and wind speeds of 9 to 18 mph, wind chill values in the -40s were common across Sheridan County.  The coldest wind chill value of -48 was recorded at the Comertown Turn-Off MT-5 DOT site at 6:13 AM.

Cold/Wind Chill in WESTERN ROOSEVELT, MONTANA
From 07-FEB-19 04:38:00 to 08-FEB-19 16:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Combining multiple observations from across western Roosevelt County, temperatures in the -20s and -30s and wind speeds of 9 to 16 mph, resulted in wind chill values from the -40s to the -60s.  The coldest wind chill value of -66 was recorded at the Poplar RAWS site at 8:18 AM on the 8th.

Cold/Wind Chill in RICHLAND, MONTANA
From 07-FEB-19 02:24:00 to 08-FEB-19 13:38:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

With temperatures near -20 and wind speeds of 9 to 19 mph, wind chills values around -40 occurred in a few separate events.  The coldest wind chill value of -48 was recorded at 11:54 AM on the 8th at the Sioux Pass MT-16 DOT site.

Cold/Wind Chill in DAWSON, MONTANA
From 07-FEB-19 12:21:00 to 08-FEB-19 08:53:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

With temperatures in the -10s and -20s and wind speeds of 9 to 17 mph, winds chills in the -40s were common across Dawson County.  The coldest wind chill reading of -47 was recorded at 2:21 AM on the 7th at the Lindsay Divide MT-200 DOT site.

Cold/Wind Chill in MCCONE, MONTANA
From 07-FEB-19 19:53:00 to 08-FEB-19 07:50:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Even though winds were calm, the temperatures alone were near or colder than -40 for most of the night of the 7th and most of the morning of the 8th.  The coldest temperature reading of -44 was recorded at 3:59 AM on the 8th at the Cow Creek MT-13 DOT site.