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John Wheeler, WDAY, Published October 24 2010

Weather Talk: Halloween usually signals colder weather in region

Next Sunday is Halloween. Have you noticed that our weather almost always starts to turn cold around Halloween?

September weather is generally cooler than summer, but a much larger decline in temperature usually happens around here in late October and November. The reason for this is the development of snow cover to our north.

During September, persistent snow cover is limited to the high Arctic regions north of the Arctic Circle. But during October, snow cover usually begins to spread across Siberia, Alaska, and northern Canada down into the Hudson Bay region.

Snow cover reflects sunlight and causes a significant drop in temperature, and when that snow cover begins to spread southward, it brings cold air that much closer to home.

Eventually, of course, our area gets covered in snow, and this is usually followed by much colder temperatures. We can still get relatively mild weather after snow, but it becomes harder to maintain and requires just the right circumstances.

Have a weather question you’d like answered? E-mail weather@wday.com, or write to WDAY Stormtracker, WDAY-TV, Box 2466, Fargo, ND 58108