2021 Was a Year of “Weather Whiplash” in the West

Heat was the only constant.

A cyclist in Phoenix on Tuesday, June 15, 2021. Ross D. Franklin/AP

This story was originally published by High Country News and is reproduced here as part of the Climate Desk collaboration.

In early September of 2021, as the Caldor Fire raged toward Lake Tahoe through eastern California’s drought-addled forests, staff at the Sierra-at-Tahoe ski resort made a desperate bid to fend off the advancing flames: They aimed snowmaking machines at structures and cranked up the water-misting cannons to douse an area that hadn’t seen a lick of rain in months.

At the same time, some 500 miles due east, little more than a trickle of water ran down the broad sandy bed of the Dirty Devil River in eastern Utah. Then a moisture-laden storm dumped its load on the Henry Mountains, filling arroyos to the brim. Over the course of hours, the Dirty Devil’s flow shot up to a churning 14,000 cubic feet per second—more than four times that of the nearby Colorado River—overflowing the normally dry arroyo’s banks. Water flowed six feet deep through streets and parking lots in Hanksville, sweeping away cars and a 500-gallon propane tank and inundating homes and hotels.

This stark contrast epitomizes 2021 in the West, where the devastating effects of drought were juxtaposed with drenching deluges in neighboring states. But amid all the weather whiplash, there was one constant: Temperatures were above “normal” all year long.   

2
Number of days in June the high temperature did not exceed 100 degrees in Phoenix, Arizona.

138
Estimated number of people who died of heat-related causes in Washington between June 26 and Aug. 31, 2021.

7

Number of heat-related fatalities in the state in 2020.

54
Number of heat-related fatalities in Multnomah County, Oregon, during the June “heat dome”; most of the victims were older, lived alone and lacked air conditioning, according to the county health department.

252
Number of confirmed heat-related fatalities in Maricopa County, Arizona, between April 11 and Nov. 1, 2021.

2
Number of weeks climate change has lengthened the growing season in the Greater Yellowstone region since 1950.

1.88 inches
Amount of precipitation received in Denver between June 1 and Nov. 30, the lowest since record-keeping began in 1872.

118 degrees Fahrenheit
Temperature at Dallesport, Washington, on June 28, the highest ever for the state.

111 degrees Fahrenheit
Temperature at Porthill, Idaho, on June 28.

56.77 inches
Amount of rain that fell in Quillayute, Washington, between Sept. 1 and Nov. 30, smashing the old record of 51.81 inches set in 1975.

2,261 to 3,637
Estimated number of sequoias over four feet in diameter killed by the Windy and KNP Complex fires in California in 2021.

1.76 inches
Amount of rain that fell in Cuba, New Mexico, on Sept. 30, a new monthly record for one-day precipitation.

80 cubic feet per second
Flow in the Rio Grande at Albuquerque on Oct. 25; the median flow for that date is 350 cfs.

24
Number of homes destroyed by a central Montana wildfire on Dec. 1.

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