As of mid-September 2026, seasonal cooling driven by declining solar insolation and the approach of the September 22 autumnal equinox sets the stage for the first measurable snow, with trader focus on the timing of early polar air intrusions and jet stream dips. NOAA climatological baselines indicate typical first snow dates range from late September in northern interiors to mid-November farther south, modulated by current temperature anomalies and Arctic Oscillation patterns. Forecasters at the National Weather Service will release updated long-range outlooks in coming weeks, while ENSO monitoring provides additional context on whether neutral or developing La Niña conditions favor colder outbreaks. Model runs from the Global Forecast System and European Centre for Medium-Range Weather Forecasts will highlight any early cold snaps capable of producing flurries or accumulation before historical averages.