Some seasonal guidance suggests that snowfall could be concentrated during the early and late portions of winter, rather than being evenly distributed from December through February.
La Niña effects merge with the Stratospheric Warming, as an El Niño is
For parts of the Southwest and southern Rockies, the strongest snowfall opportunities may occur from October through December and again during March and April. January and February could produce a weaker or less consistent snow signal in some areas.
This does not mean every location will follow the same pattern. Elevation, local geography, storm timing, and short-term temperature changes will determine whether a particular storm produces rain or snow.
