What is “Indian Summer?
“Indian summer” is a phrase most North Americans use to describe an unseasonably warm and sunny patch of weather during autumn. In U.S. states that experience enough seasonal variation for a brief warming trend to be noticeable, the phenomena is generally observed anywhere from mid-October to early November and normally occurs after the first frost. The warm temperatures are usually accompanied by dry, hazy conditions. An Indian summer is typically caused by a sharp shift in the jet stream from the south to the north. The warm weather may last anywhere from a few days to over a week and may happen multiple times before winter arrives for good.
