As the fall season settles in, meteorologists are already anticipating what winter may have in store—especially with La Niña conditions likely to influence the weather across the U.S. Unlike last year’s El Niño-driven winter, this one could feature significantly different patterns, including temperature shifts, variable precipitation, and changes in snow levels.
La Niña’s Arrival and Expected Impact
La Niña is a recurring climate pattern marked by cooler-than-normal ocean temperatures in the equatorial Pacific, with the most notable effects occurring during Northern Hemisphere winters. According to the Climate Prediction Center (CPC), there is a 60% chance that a weak La Niña will develop by November, continuing through the winter and potentially lingering into early spring.
While La Niña isn’t the only factor shaping weather patterns, it often exerts significant influence—especially during strong phases. This winter, however, a weaker La Niña is expected, which means other weather phenomena may also play a role. Emily Becker, an atmospheric scientist at the University of Miami, notes that weaker La Niña events introduce more unpredictability, with other climate systems capable of interfering with typical patterns.
A Shift in Temperature and Precipitation
Winter forecasts show many telltale signs of a La Niña influence. During La Niña, the jet stream—the high-altitude air current that guides storm systems—tends to shift farther north. This usually brings wetter conditions to parts of the northern U.S., while drier and warmer weather prevails in the southern regions.
The CPC’s winter outlook for December through February reflects this pattern. Northern states, including the Pacific Northwest, Midwest, and sections of the interior Northeast, are forecasted to experience wetter-than-average conditions—much-needed relief for regions suffering from drought. In contrast, the southern U.S. is likely to face warmer and drier conditions, exacerbating ongoing drought risks.
While wetter conditions are expected in some areas, snowfall will depend on whether temperatures remain cold enough to allow snow to accumulate. Weaker La Niña winters, such as the one forecasted this year, tend to favor more snow in the Northeast compared to stronger La Niña events, which often bring warmer temperatures farther north. However, the CPC predicts that much of the East Coast may experience warmer-than-average temperatures, meaning some storms may bring more rain than snow.
Regional Differences and Potential Outcomes
In the Midwest, the combination of near-normal temperatures and above-average precipitation could increase the chance of significant snow events. Meanwhile, the Pacific Northwest is expected to receive both cooler temperatures and more moisture—ideal conditions for building a substantial snowpack. This snowpack is critical not only for tourism but also for water reserves during the warmer months.
Northern California may see near-normal precipitation, which is a shift from the exceptionally wet winters the state experienced in recent years. However, southern California could remain warmer and drier than usual, which raises concerns for wildfire activity. Without sufficient rain in the coming months, fire season may extend longer than usual, fueled by an abundance of dry vegetation.
A Different Winter Than Last Year’s El Niño
The contrast between this winter and last year’s El Niño-driven season is notable. Last winter, much of the southern U.S. saw wetter conditions, while the northern tier remained drier and warmer, leading to a significant snow drought. If this La Niña develops as predicted, the opposite pattern will emerge: wetter conditions in the northern U.S. and drier weather in the South.
Still, the weak nature of this La Niña could allow other atmospheric patterns to disrupt these trends, adding uncertainty to the forecast. The full extent of La Niña’s influence will become clearer once winter sets in.
