A strong ridge parked over the northern Rockies and brought very hot temperatures to much of western and central Wyoming. All of the lower elevations saw high temperatures 90 degrees or above with many high temperatures over 100 in the lower elevations East of the Continental Divide. The Greybull and Johnson County airports tied their all time record highs of 108 and 104 degrees respectively, on June 15th. The high of 106 at the Worland airport on June 15th missed the all time record high by 1 degree.

Heat in YELLOWSTONE NATIONAL PARK, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Well above normal temperatures occurred in Yellowstone Park. The highest temperature was 91 degrees at Mammoth Hot Springs on June 15th.

Heat in WIND RIVER BASIN, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A high temperature of 102 degrees was record in downtown Riverton, Wyoming on the 15th on June. The ASOS at the Riverton airport had a high temperature of 100 on the same day.

Heat in UPPER WIND RIVER BASIN, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The highest temperature recorded during the heat wave was 92 degrees at Crowheart, Wyoming on the 14th of June.

Heat in UPPER GREEN RIVER BASIN, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The highest temperature recorded during the heat wave was 93 degrees at Farson, Wyoming on June 15th.

Heat in UPPER GREEN RIVER BASIN FOOTHILLS, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The hottest temperature recorded during the heatwave was 91 degrees in Pinedale, Wyoming on the 14th. The Pinedale airport had a high of 90 on June 15th.

Heat in STAR VALLEY, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The hottest temperature recorded during the heatwave was 94 degrees at Etna, Wyoming on June 14th.

Heat in SOUTHWEST BIG HORN BASIN, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The hottest temperature recorded during the heatwave was 104 degrees on June 15th.

Heat in SOUTHEAST JOHNSON COUNTY, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The hottest temperature recorded during the heatwave was 102 degrees to the southwest of Kaycee, Wyoming on June 15th.

Excessive Heat in SOUTHEAST BIG HORN BASIN, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The highest temperature reported during the heatwave was 106 degrees at the Worland, Wyoming Airport on June 15th. This temperatures was only 1 degree off of the all time record high of 107.

Heat in SOUTH LINCOLN COUNTY, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Some of the hottest temperatures in southern Lincoln County, Wyoming, were 93 at Sage Junction and 92 at Kemmerer on June 15th.

Heat in LANDER FOOTHILLS, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The highest temperature recorded at the Lander, Wyoming airport during the heat wave was 98 degrees on June 15th.

Heat in JACKSON HOLE, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The highest temperature at the Jackson, Wyoming airport during the heat wave was 90 degrees on June 15th.

Heat in GREEN MOUNTAINS & RATTLESNAKE RANGE, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The highest temperature recorded at Jeffrey City, Wyoming during the heat wave was 96 degrees on June 15th.

Heat in EAST SWEETWATER COUNTY, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The highest temperature recorded at the Sweetwater County, Wyoming airport during the heat wave was 95 degrees on June 15th.

Heat in ROCK SPRINGS & GREEN RIVER, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Some of the hottest temperatures during the heat wave were 97 degrees at Green River, Wyoming and 96 degrees at Rock Springs, Wyoming on June 15th.

Excessive Heat in NORTHEAST JOHNSON COUNTY, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The high temperature of 104 at the Johnson County, Wyoming airport on June 15th tied the all time record high temperature.

Excessive Heat in NORTH BIG HORN BASIN, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Very hot temperatures occurred in Big Horn County. The high temperature of 108 degrees at the Greybull, Wyoming airport tied the all time record high temperature.

Heat in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The highest temperature at the Natrona County, Wyoming airport during the heat wave was 101 degrees on June 15th.

Heat in CODY FOOTHILLS, WYOMING
From 11-JUN-21 00:00:00 to 17-JUN-21 23:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Some of the hottest temperatures recorded in the Cody Foothills during the heat wave included 102 at Clark, Wyoming on June 15th and 100 at the Cody, Wyoming Airport on June 14th.