Unseasonably warm air over Wyoming during the first nine days of November was quickly ushered out of the state on November 10. An air mass with origins in Siberia plunged south across western and central Wyoming and ushered in record cold temperatures. Casper set an all-time November record low temperature of 27 below zero on Wednesday, November 12. This reading also shattered the old monthly record by 6 degrees. Low temperatures of 10 below to around 25 below zero were common across the area. Many locations not only set record low temperatures but also daily records for the lowest maximum temperature.

Cold/Wind Chill in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Temperatures at the Casper-Natrona County International Airport set three record low temperatures from Tuesday, November 11, until Thursday, November 13. The minimum readings were 19 below, 27 below, and 26 below zero, respectively. The low of 27 below zero on Wednesday, November 12, was the all-time record low for November. Record low maximums were also recorded with highs of only 6 above, 3 above, and 8 above zero on the same three days. Wind chill temperatures fell to as low 43 below zero at Hiland on the 12th.

Cold/Wind Chill in UPPER GREEN RIVER BASIN, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The ASOS at the Big Piney Airport set new record low temperatures of 15 below zero on November 12, and 18 below zero on November 13. Record low maximums were also recorded from November 11, 12, and 13, as temperatures only climbed to 15, 11, and 10 above zero, respectively.

Cold/Wind Chill in NORTHEAST JOHNSON COUNTY, WYOMING
From 11-NOV-14 00:00:00 to 14-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Record low temperatures of 11 below and 13 below zero were set at the Johnson County Airport in Buffalo airport on November 12 and 13. Record low maximums were also for four straight days from the 11th through the 14th with readings of 9, 7, 11, and 13, respectively.

Cold/Wind Chill in NORTH BIG HORN BASIN, WYOMING
From 11-NOV-14 00:00:00 to 14-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A new record low temperature of 16 below zero was achieved at the South Big Horn County Airport near Greybull on Thursday, November 13. New record low maximum temperatures of 6, 10, 15, were recorded on November 12, 13, and 14, respectively.

Cold/Wind Chill in YELLOWSTONE NATIONAL PARK, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 00:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Record lows of 12 below and 20 below zero were recorded at Lake Yellowstone on November 11th and 12th, respectively. Record low maximums were also recorded with highs of 8 on the 11th and 9 on the 12th.

Cold/Wind Chill in LANDER FOOTHILLS, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

New record low temperatures of 13 below and 18 below zero were observed at Hunt Field in Lander on November 12 and 13, respectively. Also, a record low maximum of 3 above zero was recorded on both days.

Cold/Wind Chill in WIND RIVER BASIN, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A record low temperature of 21 below zero was recorded in downtown Riverton on Thursday, November 13. New record low maximum temperatures of 9 above zero, 4 above zero, and zero were set on November 11, 12, and 13, respectively.

Cold/Wind Chill in EAST SWEETWATER COUNTY, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Rock Springs-Sweetwater County Airport recorded record low temperatures of 4 below, 11 below, and 12 below zero on November 11, 12, and 13, respectively. Record low maximum temperatures of 9, 4, and 11, were also observed on the same three days.

Cold/Wind Chill in SOUTHEAST BIG HORN BASIN, WYOMING
From 11-NOV-14 00:00:00 to 13-NOV-14 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Worland Airport recorded new record low temperatures of 21 below and 28 below zero on November 12 and 13, respectively. Record low maximums of 3 above on the 12th and 5 above on the 13th were also observed.