Very strong high pressure aloft developed across the Desert Southwest in mid to late June. This lead to prolonged excessive heat across the lower deserts of northern Arizona. High temperatures exceeded 110 over the lower elevations of Yavapai County and along the Colorado River in the Grand Canyon.  Numerous high temperature records were tied or broken, even at higher elevations.

Excessive Heat in CHINLE VALLEY, ARIZONA
From 17-JUN-17 11:00:00 to 22-JUN-17 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The high of 97 in Canyon de Chelly on June 17 tied record last set in 2002.
The high of 103 in Canyon de Chelly on June 23 broke the record of 101 last set in 2012.

Excessive Heat in LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY, ARIZONA
From 17-JUN-17 11:00:00 to 24-JUN-17 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The high of 102 in Winslow on June 17 broke the previous record of 100 set in 1974.
The high of 103 in Winslow on June 18 tied the previous record last set in 1940.
The high of 105 in Winslow on June 19 broke the previous record of 104 set in 2016.
The high of 103 at the Petrified Forest on June 19 broke the previous record of 101 set in 2016.
The high of 108 in Winslow on June 21 broke the previous record of 106 set in 2012.
The high of 105 at Petrified Forest on June 21 broke the previous record of 103 set in 2012.
The high of 107 in Winslow on June 22 broke the previous record of 105 set in 1961.
The high of 104 in Winslow on June 23 tied record last set in 1961.
The high of 104 in Winslow on June 24 tied record last set in 1961.

Excessive Heat in LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY, ARIZONA
From 18-JUN-17 11:00:00 to 23-JUN-17 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The high of 95 in Springerville on June 18 tied the previous record last set in 2016.
The high of 98 in Springerville on June 20 broke the previous record of 97 last set in 2016.
The high of 95 in Springerville on June 22 tied the previous record last set in 2012.
The high of 95 in Springerville on June 23 broke the previous record of 94 last set in 1954.

Excessive Heat in NORTHERN GILA COUNTY, ARIZONA
From 18-JUN-17 11:00:00 to 20-JUN-17 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The high of 104 in Payson on June 19 broke the previous record of 103 last set in 2016.
The high of 105 in Payson on June 20 broke the previous record of 103 last set in 2016.

Excessive Heat in WESTERN MOGOLLON RIM, ARIZONA
From 18-JUN-17 11:00:00 to 24-JUN-17 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The high of 92 at the Flagstaff Airport (7000 feet) on June 18 tied the previous record  last set in 1940.
The high of 93 at the Flagstaff Airport (7000 feet) on June 23 tied the previous record  last set in 1974.
The high of 90 in Bellemont (7156 feet) on June 24 tied the previous record  last set in 2015.

Excessive Heat in YAVAPAI COUNTY MOUNTAINS, ARIZONA
From 16-JUN-17 11:00:00 to 24-JUN-17 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The high of 96 at Prescott Airport on June 16 tied the previous record last set in 1974.
The high of 102 at Prescott Airport on June 18 broke the previous record of 100 set in 1989.
The high of 103 in Seligman on June 18 tied the previous record last set in 1940.
The high of 102 at Prescott Airport on June 19 tied the previous record last set in 2016.
The high of 105 in Seligman on June 19 broke the previous record of 103 set 1940.
The high of 103 at Prescott Airport on June 24 broke the previous record of 102 set 2016.
The high of 103 at Prescott Airport on June 21 broke the previous record of 100 set 1990.
The high of 103 in Seligman on June 23 broke the previous record of 102 set 1968.
The high of 101 at Prescott Airport on June 23 broke the previous record of 98 set 2006.
The high of 104 in Seligman on June 23 broke the previous record of 103 set 1961.
The high of 101 at Prescott Airport on June 24 broke the previous record of 100 set 1974.
The high of 103 in Seligman on June 24 tied the previous record last set in 1994.

Excessive Heat in YAVAPAI COUNTY VALLEYS AND BASINS, ARIZONA
From 17-JUN-17 11:00:00 to 24-JUN-17 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The high of 108 in Cottonwood - Tuzioot on June 17 broke the previous record of 107 set in 1985.
The high of 113 in Cottonwood - Tuzioot on June 18 broke the previous record of 111 set in 1985.
The high of 115 in Cottonwood - Tuzioot on June 19 broke the previous record of 111 set in 2016.
The high of 115 in Cottonwood - Tuzioot on June 21 broke the previous record of 110 set in 1994.
The high of 115 in Cottonwood - Tuzioot on June 22 broke the previous record of 110 set in 1988.
The high of 113 in Cottonwood - Tuzioot on June 23 broke the previous record of 111 set in 1994.
The high of 115 in Cottonwood - Tuzioot on June 24 broke the previous record of 110 set in 1994.