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Upper San Pedro River Valley storm history

Storm events recorded in Upper San Pedro River Valley, Arizona between 1950 and 2025.

136
Total events
0
Tornadoes
0
Hail
0
Floods
25
Deaths
$13.7M
Property damage

Most significant events

Strongest tornadoes, deadliest events, and biggest damage in this county. Up to 50 shown.

August 6, 2025 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat1 death
High temperatures in Southeastern Arizona were 6 degrees above normal, causing Major HeatRisk. A Benson CWOP site reached a high temperature of 109 degrees Fahrenheit. The Pima County Medical Examiner found that heat was a contributing factor in the cause of death for an individu…
August 5, 2025 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat1 death
High temperatures in Southeastern Arizona were 6 degrees above normal, causing Major HeatRisk. The Sierra Vista CWOP reached a high temperature of 100 degrees Fahrenheit. The Pima County Medical Examiner found that heat was a factor in the cause of death for an individual in Here…
July 29, 2025 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
High temperatures in Southeastern Arizona were 5 degrees above normal, causing Moderate HeatRisk. A Benson CWOP site reached a high temperature of 98 degrees Fahrenheit. The Pima County Medical Examiner found that heat was a factor in the cause of death for an individual in Benso…
February 15, 2025 · Upper San Pedro River Valley, Arizona
Cold/Wind Chill Cold/Wind Chill1 death
Cold morning temperatures near normal across Southeastern Arizona. The Sierra Vista Regional Airport reached a low temperature of 39 degrees Fahrenheit. The Pima County Medical Examiner confirmed that hypothermia was the primary factor in the cause of death for an individual in S…
January 25, 2025 · Upper San Pedro River Valley, Arizona
Cold/Wind Chill Cold/Wind Chill1 death
Cold morning temperatures were 4 to 7 degrees below normal across Southeastern Arizona. The Sierra Vista Municipal Airport reached a low temperature of 45 degrees Fahrenheit. The Pima County Medical Examiner confirmed that environmental cold exposure was the primary factor in the…
September 12, 2024 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Hot temperatures about 3 to 6 degrees above normal were experienced in Sierra Vista on September 12, causing the Moderate Heat Risk category to be reached. The Fort Huachuca ASOS topped out at 94 degrees on September 12. The Pima County Medical Examiner confirmed that heat was th…
June 22, 2024 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat1 death
Hot temperatures about 6 degrees above normal were experienced in western Cochise County on June 22, causing the Major Heat Risk category to be reached. Benson had a high of 106 degrees on June 22. The Pima County Medical Examiner confirmed that heat was a contributing factor in …
September 6, 2023 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Hot temperatures around 5 degrees above normal caused the Moderate Heat Risk category to be reached in Benson where temperatures topped out near 100 degrees. The Pima County Medical Examiner determined heat to be a contributing factor in the death of an intoxicated individual fou…
August 16, 2023 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Hot temperatures 4 to 7 degrees above normal, in the upper 90s, caused the Moderate Heat Risk category to be reached across southern Cochise County. The Pima County Medical Examiner determined that heat was the primary cause of death for one individual found in the desert near th…
July 31, 2023 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Hot temperatures 3 to 5 degrees above normal caused the Moderate Heat Risk category to be reached in the Sierra Vista area where temperatures reached the mid to upper 90s. The Pima County Medical Examiner determined heat to be the primary cause of death for an elderly man who die…
July 15, 2023 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat1 death
Very hot temperatures of 10 to 15 degrees above normal caused the Major Heat Risk category to be reached in Cochise County July 15-22. Record highs included 111 degrees July 17-18, and 110 July 20-21 at Cascabel; 104 July 21-22 at Tombstone; 106 on July 21, and 105 July 18-20 and…
July 3, 2023 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat3 deaths
Very hot temperatures of 4 to 8 degrees above normal caused the Major Heat Risk category to be reached July 3-8. Record highs of 104 degrees on July 7 and 102 on July 8 occurred in Sierra Vista. The hottest temperature was 108 at Cascabel on July 3, 6 and 7. The Pima County Medic…
May 26, 2022 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Hot temperatures 5 to 10 degrees above normal, in the upper 90s, were experienced in southwest Cochise County on May 26 causing the Moderate Heat Risk category to be reached. The Pima County Medical Examiner confirmed that heat was the primary cause of death for one individual fo…
May 18, 2022 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Hot temperatures around 5 degrees above normal, in the mid to upper 90s, caused the moderate heat risk category to be reached on May 18. The Pima County Medical Examiner confirmed that heat was the primary cause of death for one elderly individual found outdoors in Saint David.
August 6, 2021 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Temperatures 5 degrees above normal, 95 to 100 degrees, occurred in the San Pedro River Valley of Cochise County causing the Moderate Heat Risk category to be reached on August 6. The Pima County Medical Examiner confirmed that heat was the primary cause of death for one male fou…
July 10, 2021 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Temperatures 5 to 10 degrees above normal near 100 degrees, occurred in southern Cochise County causing the Moderate Heat Risk category to be reached on July 10. The Pima County Medical Examiner confirmed that heat was the primary cause of death for one male found in the desert n…
June 12, 2021 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat1 death
Very hot high temperatures of 103 to 112 degrees, or 8 to 16 degrees above normal, occurred in the lower elevations of Cochise County June 12-14, and caused the High Heat Risk category to be reached. New record daily high temperature records were established at several sites, inc…
August 23, 2020 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Temperatures 5 to 9 degrees above normal in the upper 90s occurred in southwest Cochise County causing the Moderate Heat Risk category to be reached on August 23rd. The Pima County Medical Examiner confirmed that heat was the primary cause of death for one male near the San Pedro…
July 16, 2020 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Above normal temperatures occurred in southwest Cochise County on July 16th. High temperatures included 98 at Hereford and 95 at Tombstone. US Border Patrol and Cochise County Sheriff personnel responded to a call about a companion who was suffering from heat exhaustion near Here…
August 14, 2019 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Above normal temperatures occurred in the San Pedro River Valley of Cochise County on August 14th. High temperatures were ranged from the upper 90s in the southwest part of the county to the lower 100s in northwest sections. The warmest temperature was 105 degrees in Cascabel whi…
December 29, 2018 · Upper San Pedro River Valley, Arizona
Winter Weather Winter Weather1 death
Snow melted as it fell on December 29th, but refroze after dark as one to two inches of new snow accumulated after dark. A single vehicle rollover accident occurred on icy roadways shortly after snow had ended on State Route 92 near Hereford. The pickup truck's only occupant was …
June 26, 2018 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Well above normal temperatures occurred in Cochise County on June 26th. A temperature of 107 degrees occurred at Cascabel with 100 at Benson and Willcox. The Pima County Medical Examiner confirmed that heat was the primary cause of death for one adult male west of Dragoon.
May 16, 2018 · Upper San Pedro River Valley, Arizona
Heat Heat1 death
Well above normal temperatures occurred in the San Pedro River Valley of Cochise County May 16th through May 18th. The hottest day was May 17th when a high temperature of 96 degrees was recorded at Tombstone and 97 degrees at Saint David. The Pima County Medical Examiner confirme…
May 9, 2011 · Upper San Pedro River Valley, Arizona
Strong Wind Strong Wind$11.2M damage
Strong surface winds occurred in Sierra Vista. Homeland Security's aerostat, an anti-trafficking balloon, broke free from its tether and crashed into the Canyon de Flores neighborhood in Sierra Vista. Equipment from the aerostat was picked up from 39 different sites throughout th…
July 13, 2025 · Upper San Pedro River Valley, Arizona
Dust Storm Dust Storm
Multiple trained spotters reported via social media a big dust storm tracking through all of Cochise county with visibilities dropping to below 0.25 miles at times.
July 1, 2025 · Upper San Pedro River Valley, Arizona
Drought Drought
Extreme Drought (D3) continued in the Upper San Pedro River Valley in the month of July. For the month of July, Cochise county ranked the 39th driest for the period of record. Soil moisture readings increased to between the 20th and 30th percentile for the month of July. The Extr…
June 1, 2025 · Upper San Pedro River Valley, Arizona
Drought Drought
Extreme Drought (D3) continued in the upper San Pedro river valley in the month of June. For the month of June, Cochise county ranked the 30th wettest for the period of record. Soil moisture readings increased to between the 1st and 5th percentile for the month of June.
May 1, 2025 · Upper San Pedro River Valley, Arizona
Drought Drought
The extreme (D3) drought category continued in the Upper San Pedro Valley in May. The drought area remained the same. For the month of May, Cochise county ranked the 20th driest for the period of record. Soil moisture readings continued below the 1st percentile for the month of M…
April 1, 2025 · Upper San Pedro River Valley, Arizona
Drought Drought
The extreme (D3) drought category continued in the Upper San Pedro Valley in April. The drought area remained the same. For the month of April, Cochise county ranked the 48th driest for the period of record. Soil moisture readings fell below the 1st percentile for the month of Ap…
March 13, 2025 · Upper San Pedro River Valley, Arizona
High Wind High Wind
ASOS KALK reported a max non thunderstorm wind gust of 61 mph.
March 1, 2025 · Upper San Pedro River Valley, Arizona
High Wind High Wind
Fort Huachuca measured maximum non thunderstorm wind gust of 59 mph.
January 8, 2025 · Upper San Pedro River Valley, Arizona
High Wind High Wind
Mesonet station QMRA3 Muleshoe Ranch measured wind gust of 59 mph.
August 3, 2024 · Upper San Pedro River Valley, Arizona
Heat Heat
Hot temperatures about 7 to 11 degrees above normal were experienced in the upper San Pedro River Valley, causing the Major Heat Risk category to be reached.
July 10, 2024 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat
Hot temperatures 7 to 10 degrees above normal were experienced in the Upper San Pedro River Valley on July 10 causing the Major Heat Risk category to be reached.
June 11, 2024 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat
Hot temperatures 8 to 12 degrees above normal were experienced in the Upper San Pedro River Valley, causing the Major Heat Risk category to be reached. Benson topped out at as high as 108 degrees on June 12.
June 6, 2024 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat
Hot temperatures 5 to 8 degrees above normal were experienced in the Upper San Pedro River Valley on June 6 and June 7, causing the Major Heat Risk category to be reached. Benson topped out at 106 degrees on June 6 and June 7.
February 10, 2024 · Upper San Pedro River Valley, Arizona
Winter Weather Winter Weather
About 3 inches of snow occurred in Sierra Vista. Accumulation was mainly on colder surfaces.
February 6, 2024 · Upper San Pedro River Valley, Arizona
High Wind High Wind
The KALK ASOS at Pioneer Airfield Ft Huachuca Arizona recorded a wind gust to 59 mph.
July 19, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
Two lightning caused fires started at nearly the same time on July 19 on either side of Interstate 10 west of Dragoon in Cochise County. Both fires were spread by thunderstorm winds on July 20. The Robles Fire to the south of I-10, which consumed 3000 acres, was contained on July…
July 19, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
The lightning caused Chimney Fire started on July 19 and burned 1,636 acres on the far east side of the Santa Catalina Mountains in northeast Pima County before becoming contained on July 22. Fire suppression costs tallied $1 million.
June 27, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
The human-caused West Hemp Fire started June 27 on the grounds of Fort Huachuca when the blades of a lawn mower struck a rock. The fire quickly spread to more than 1,000 acres in gusty winds and dry conditions. The fire damaged power poles, causing the base to temporarily switch …
June 26, 2023 · Upper San Pedro River Valley, Arizona
Excessive Heat Excessive Heat
Very hot temperatures 6 to 11 degrees above normal were experienced in the lower elevations of Cochise, Graham, Greenlee, Santa Cruz and southeast Pinal counties June 26-27, causing the Major Heat Risk category to be reached. Some of the hottest temperatures during the period wer…
June 22, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
The human-caused Post Fire started June 22 several miles southwest of Benson and spread rapidly to the northeast due to gusty winds. State Route 90 was closed for a time and several rural residents were temporarily evacuated. The fire consumed a total of 921 acres before becoming…
June 22, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
On June 22, three fires were started along State Route 92 between Sierra Vista and Palominas by a vehicle dragging a loose chain. The fires spread rapidly due to gusty winds with two fires combining to form the Wildhorse Fire. State Route 92 was closed for a time and residents of…
June 16, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
The human caused Oak started on June 16 north of Sonoita. The fire spread rapidly northeast in windy and dry conditions and resulted in the closure of State Route 83. The fire consumed 3,213 acres before becoming fully contained on June 23. Fire suppression costs tallied $1.2 mil…
April 3, 2023 · Upper San Pedro River Valley, Arizona
Wildfire Wildfire
The human caused Williams Fire started on April 3 in the Hereford area in Cochise County. The wildfire was driven by wind gusts of 45 mph, spread northeast in dry grass, and destroyed two residences and three outbuildings near the intersection of Williams and Waters Rds. The fire…
March 1, 2023 · Upper San Pedro River Valley, Arizona
Heavy Snow Heavy Snow
About 4 to 5 inches of snow fell in the Benson area with 4 inches in the Tombstone area, resulting in difficult driving conditions. One to four inches in the Sierra Vista area caused schools to be closed for the day.
February 22, 2023 · Upper San Pedro River Valley, Arizona
High Wind High Wind
Several trees were uprooted in Sierra Vista where at least one home sustained moderate roof damage. Winds peeled shingles off a garage near Benson. A peak wind gust of 68 mph was recorded at KALK Pioneer Airfield ASOS at 1006MST and 64 mph at KFHU Libby Field ASOS at 1009MST. Sus…
February 14, 2023 · Upper San Pedro River Valley, Arizona
High Wind High Wind
Sustained winds were measured at 40 mph in the Sierra Vista area with the KALK ASOS reporting 40 mph at 1156MST.
December 28, 2022 · Upper San Pedro River Valley, Arizona
High Wind High Wind
Sustained southwest winds of 40 mph and gusts greater than 60 mph were observed in the Sierra Vista area. KALK Pioneer Field measured a gust to 66 mph at 1039MST and 1109MST while KFHU Libby Field measured a gust to 63 mph at 1038MST. Two power poles were downed along Cherokee Av…

Events by year

YearEventsTornadoes
2025130
202480
2023160
202290
2021150
2020150
201940
2018140
201730
201630
201510
201480
201380
201210
2011170
201010