El Niño May Delay First Snowfall Across US Regions This Year

Meteorologists define accumulating snow as at least 0.1 inches of measurable precipitation that does not immediately melt upon contact with the ground, distinguishing it from mere flurries.

The average first snowfall timeline varies significantly by region based on a thirty-year dataset spanning 1991 to 2020 according to National Weather Service data. In the northern tier and Mountain West, October marks the typical onset of seasonal accumulating snow, whereas many other areas usually wait until November or December.

The southern United States generally does not experience annual accumulating snowfall; when it occurs there, January and February are more common times for measurable accumulation.

While these averages indicate that Wisconsin typically sees its first snow in October with an average total of 0.3 inches, specific years can deviate significantly from this norm as seen in 2025 or 2023.

This winter is expected to differ due to the super El Niño phenomenon which may shake up these typical timelines by potentially delaying the onset of snow and lowering overall totals across various regions.