Portland, Oregon — An unusually warm winter across much of the western United States is prompting growing concern among meteorologists and climate researchers, who warn that reduced snowfall and a shrinking snowpack could set the stage for a difficult wildfire season later this year. Experts say conditions are already trending in a troubling direction, though the full impact may not be clear until spring arrives.
The warning comes as cities across the West continue to experience temperatures more typical of early spring than midwinter.
Record Warmth Taking Hold in the Pacific Northwest
So far, winter has delivered historic warmth to parts of the Pacific Northwest. Portland recently recorded its warmest December on record, with an average temperature of 47.4 degrees, nearly six degrees above normal. That figure is closer to what the city typically experiences in March.
January has followed a similar path. Through the first half of the month, 11 of the first 12 days have been warmer than average, extending concerns about the lack of sustained cold and snowfall.
Meteorologists say this warmth is pushing snow levels dangerously high. According to reports, snow levels in Oregon’s Cascades are expected to rise to around 8,000 feet, limiting snow accumulation at lower elevations that typically contribute significantly to seasonal snowpack.
Snowpack Falling Well Below Normal
The mild pattern is already taking a toll on mountain snowpack across the western U.S., which experts say is running well below seasonal averages.
“We won’t know how bad those conditions are until we’re there, unfortunately,” said Adam Batz, a meteorologist with the National Weather Service office in Portland. “But generally, a better snowpack means that our odds would be better to not have as bad of a fire season.”
Early warning signs appeared even before winter fully set in, when snowfall across large portions of the western U.S. measured at its lowest levels in decades.
Warmth Extends Beyond Oregon
Portland is far from alone. Climate analysts say the warmth has stretched across much of the western interior as well.
According to Climate Central, Fort Collins, Colorado also experienced its warmest December on record, with temperatures reaching 70 degrees on three separate days. The city recorded above-normal temperatures on 26 of 31 days during the month.
“The West is on pace to experience one of the warmest winters on record,” Climate Central researchers said.
National Data Shows Broader Warming Trend
The unusual winter warmth aligns with broader national climate data. The National Centers for Environmental Information reported that the contiguous United States experienced its fourth-warmest year on record in 2025, based on 131 years of climate records.
“Temperatures were above average nationwide, with the most pronounced warmth across the western third of the country,” researchers noted. “From the West Coast through the Rocky Mountains, this region recorded its warmest annual temperature on record.”
Scientists say this long-term warming trend is increasing the likelihood of winters that fail to build adequate snowpack.
Why Snowpack Matters for Fire Season
Snowpack acts as a natural reservoir, slowly releasing water into rivers, soils, and forests during spring and early summer. When snowpack is thin, landscapes dry out faster, increasing the risk of wildfire ignition and spread.
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According to the National Snow and Ice Data Center, total snow cover across the western U.S. was less than half of the median for this time of year based on climate data from 2001 to 2025.
That deficit raises concerns not just for wildfire danger, but also for water supplies, agriculture, and hydroelectric power generation.
Wildfire Seasons Growing Longer and More Intense
Climate researchers say the trend toward warmer winters is already reshaping wildfire behavior.
“Wildfire seasons are lengthening and intensifying, particularly in the western U.S.,” Climate Central researchers said. “Even parts of the eastern U.S. have seen smaller but still impactful increases in fire weather days.”
With less snow on the ground, vegetation can dry out earlier in the year, allowing fire season to begin sooner and last longer.
Warm Pattern Expected to Continue — For Now
Forecasts suggest that above-average temperatures are likely to persist across much of the West this week, with afternoon highs running five to 15 degrees above normal or more in some areas through the weekend.
That continued warmth could further erode snowpack unless colder, wetter systems arrive soon.
Hope Remains for a Late-Season Shift
Despite the concerning trend, meteorologists say there is still time for conditions to improve before spring.
“It’s not impossible that we go into an active pattern toward the end of this month into February,” Batz said. “There’s plenty of time for some winter weather.”
For now, experts say the focus is on monitoring snowpack trends and preparing for the possibility that this year’s wildfire season could arrive earlier and burn more intensely than usual if current conditions persist.
Do you think warmer winters are becoming the new normal where you live, or could this pattern still reverse later this season? Share your thoughts in the comments below.
