Weather
Arizona Winter 2026-27: Flagstaff, 21-Inch Snow History
ARIZONA – Phoenix, Flagstaff, Tucson and Prescott face sharply different winter conditions as the 2026 27 season approaches. Arizona's historical annual snowfall averages approximately 20.56 inches ac
By Cameron Hayes · 2026-10-20T10:21:41.897Z
ARIZONA – Phoenix, Flagstaff, Tucson and Prescott face sharply different winter conditions as the 2026 27 season approaches. Arizona's historical annual snowfall averages approximately 20.56 inches across weather stations statewide, but that figure masks major elevation differences. El Niño does not eliminate mountain snowstorms, dangerous cold or winter travel disruptions, which can continue through March.
According to the National Oceanic and Atmospheric Administration NOAA , its October 15, 2026, outlook for December through February places Arizona largely within an equal chances temperature category, meaning no temperature outcome is favored. The precipitation outlook favors above normal totals across much of the state, particularly southern Arizona. These seasonal probabilities do not predict snowfall amounts or individual storms.
What Arizona's Snowfall History Actually Shows Arizona's 20.56 inch historical snowfall average reflects measurements across weather stations statewide, not conditions in Phoenix, Tucson or Flagstaff individually.
Northern Arizona's higher elevations, including Flagstaff, the Mogollon Rim and the White Mountains, receive substantially more snowfall than lower desert communities.
NOAA historical snowfall maps covering El Niño winters from 1950 through 2009 show generally positive snowfall anomalies across portions of Arizona, especially during stronger events.
However, those maps do not establish a directly comparable statewide El Niño snowfall average.
Below average snowfall does not mean insignificant snowfall.
Why El Niño Doesn't Guarantee an Easy Winter El Niño can strengthen the southern branch of the Pacific jet stream, directing additional moisture and storms toward the Southwest.
For Arizona, that can mean more opportunities for mountain snowfall, while lower elevations experience rain.
Cold air accompanying Pacific storms can produce snow around Flagstaff, Payson and Show Low, even when statewide seasonal temperatures finish near or above normal.
Rain to snow transitions can also create rapidly changing road conditions.
What This Means Through March Travelers along Interstate 40 near Flagstaff, Interstate 17 between Phoenix and Flagstaff, and U.S. Route 60 through eastern Arizona should remain prepared for winter hazards.
Snow covered pavement, icy mountain passes and reduced visibility can disrupt travel.
NOAA's December–February outlook does not include March 2027, when late season snowstorms remain possible across Arizona's higher terrain.
El Niño changes Arizona's seasonal probabilities, but it does not guarantee a snow free or disruption free winter.