After loss of diurnal heating during the day on the 23rd of February, another round of frigid wind chills took place before Chinook winds were able to warm most areas up later on the 24th.

Extreme Cold/Wind Chill in MEAGHER COUNTY VALLEYS, MONTANA
From 24-FEB-23 06:08:00 to 24-FEB-23 06:08:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Newlan Creek RAWS (NCRM8) measured one wind chill of -42 F.

Extreme Cold/Wind Chill in BIG BELT, BRIDGER AND CASTLE MOUNTAINS, MONTANA
From 23-FEB-23 21:57:00 to 24-FEB-23 00:27:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Two sensors measured wind chills of -40 F or less, including Mesonet station MTDPC Deep Creek Pass and MTBZH Bozeman Pass. THe minimum wind chill observed was at Bozeman Pass and was -44 F.

Extreme Cold/Wind Chill in NORTHERN HIGH PLAINS, MONTANA
From 23-FEB-23 15:38:00 to 24-FEB-23 04:22:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple sensors measured wind chills of -40 F or less, including MTBWG Browning DOT and MTBRN Two Medicine Bridge. The coldest wind chill observed in this zone was -51 F at the Browning DOT sensor.

Extreme Cold/Wind Chill in EASTERN GLACIER, WESTERN TOOLE, AND CENTRAL PONDERA, MONTANA
From 23-FEB-23 18:12:00 to 24-FEB-23 10:06:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Multiple sensors measured wind chills of -40 F or less including the KCTB Cut Bank ASOS. The coldest wind chill was observed at MTSWT Sweetgrass and was -51 F.

Extreme Cold/Wind Chill in EAST GLACIER PARK REGION, MONTANA
From 23-FEB-23 19:11:00 to 23-FEB-23 19:11:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Saint Mary RAWS (SRYM8) measured a wind chill of -42 F the evening of the 23rd.

Extreme Cold/Wind Chill in HILL COUNTY, MONTANA
From 23-FEB-23 19:50:00 to 24-FEB-23 07:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple mesonets measured wind chills of -40 F or less, including MTINV Inverness and FW1664 Hingham. The coldest observed wind chill was -43 F at GW2486 Rudyard.

Extreme Cold/Wind Chill in JUDITH BASIN COUNTY AND JUDITH GAP, MONTANA
From 23-FEB-23 18:41:00 to 23-FEB-23 21:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple mesonets measured wind chills of -40 F or less, including MTGYS Geyser and mtm09 Moccasin. The minimum wind chill was observed by the Geyser sensor and was -43 F.

Extreme Cold/Wind Chill in GATES OF THE MOUNTAINS, MONTANA
From 23-FEB-23 19:38:00 to 23-FEB-23 21:38:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station MTSBN Sieben flats measured two wind chills of -40 F or less, including a minimum wind chill of -41 F.

Extreme Cold/Wind Chill in SOUTHERN HIGH PLAINS, MONTANA
From 23-FEB-23 21:30:00 to 24-FEB-23 07:55:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Multiple sensors measured wind chill of -40 F or less, including DELMT Dellwo and AWOS station K1GM Golf. The minimum measured wind chill was -48 at HODMT Hodgkiss.

Extreme Cold/Wind Chill in UPPER BLACKFOOT AND MACDONALD PASS, MONTANA
From 23-FEB-23 21:56:00 to 23-FEB-23 22:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station MTMDP MacDonald Pass and mtm68 Blossburg both measures wind chills of less than -40 F in quick succession. The minimum wind chill was at MacDonald Pass and was -51 F.

Extreme Cold/Wind Chill in ELKHORN AND BOULDER MOUNTAINS, MONTANA
From 24-FEB-23 02:28:00 to 24-FEB-23 06:42:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet stations MTELK Elk Park and MTBOU Boulder Hill both measured wind chills of -40 F or less. The minimum measured wind chill was -46 F at Boulder Hill.

Extreme Cold/Wind Chill in NORTHWEST BEAVERHEAD COUNTY, MONTANA
From 23-FEB-23 19:30:00 to 23-FEB-23 23:10:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station MTBHP Big Hole Pass measured wind chills less than -40 F on two instances, including a minimum of -45 F.

Extreme Cold/Wind Chill in CASCADE COUNTY BELOW 5000FT, MONTANA
From 24-FEB-23 07:30:00 to 24-FEB-23 07:55:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Two sensors measured wind chills of -40 F, including AWOS station K1AM Alpha.

Extreme Cold/Wind Chill in FERGUS COUNTY BELOW 4500FT, MONTANA
From 23-FEB-23 19:55:00 to 24-FEB-23 05:55:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Multiple AWOS stations measured wind chills of -40 F or less, including K1EM Echo, K1OM Oscar, K1MM Mike, and K1LM Lima. The coldest wind chill was observed at K1LM Lima and was -46 F.

Extreme Cold/Wind Chill in LITTLE BELT AND HIGHWOOD MOUNTAINS, MONTANA
From 23-FEB-23 23:53:00 to 24-FEB-23 08:31:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Two sensors measured wind chills of -40 F or less, including the S Fork Judith RAWS (SFJM8) and MTMON Monarch Canyon. The minimum was measured by the RAWS and was -44 F.

Extreme Cold/Wind Chill in EASTERN PONDERA AND EASTERN TETON, MONTANA
From 23-FEB-23 19:00:00 to 24-FEB-23 07:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple mesonets measured wind chills of -40 F or less, including mtm73 Ledger, mtm05 Conrad, and coam8 Conrad. The minimum wind chill was -43 F.

Extreme Cold/Wind Chill in EASTERN TOOLE AND LIBERTY, MONTANA
From 23-FEB-23 19:15:00 to 24-FEB-23 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Multiple mesonets measured wind chills of less than -40 F, including mtm53 MDA Oilmont and GW0659 Grassy Butte. The coldest observed wind chill was -46 at EW9056 Joplin.