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An Indian summer is a period of unseasonably warm, dry weather that sometimes occurs in autumn in temperate regions of the northern hemisphere. Several sources describe a true Indian summer as not occurring until after the first frost , or more specifically the first "killing frost".
8 lug 2024 · Definition of Indian Summer, Second Summer. Here are several criteria for this weather phenomenon, according to The Old Farmer’s Almanac. It’s a period of abnormally warm weather occurring in late autumn between St. Martin’s Day (November 11) and November 20, with generally clear skies, sunny but hazy days, and cool nights.
29 lug 2024 · Indian summer, period of dry, unseasonably warm weather in late October or November in the central and eastern United States. The term originated in New England and probably arose from the Indians’ practice of gathering winter stores at this time.
- The Editors of Encyclopaedia Britannica
1 ott 2011 · Autumn heatwaves are often referred to as "Indian summers", but what does the term actually mean? Meteorologist Philip Eden explains.
11 set 2019 · We tend to refer to Indian summer as anytime we get an unseasonably warm burst of weather in the fall. But there's an official definition of Indian summer, according to the Old...
7 mag 2024 · Weather Historian William R Deedler, of the National Weather Service, describes it as “any spell of warm, quiet, hazy weather that may occur in October or even early November”. An Indian summer is typically caused by a sharp shift in the jet stream from the south to the north.
Generally, an Indian Summer occurs during October through early November. However, based on the weather elements needed for an Indian Summer to occur, it is possible that some could consider a string of warm days during December and January as an Indian Summer.