Indian Summer
by Jon Burch Photography
Title
Indian Summer
Artist
Jon Burch Photography
Medium
Photograph - Digital Capture And Enhancement
Description
The term Indian summer refers to a period of unseasonably warm, dry weather that sometimes occurs in autumn in the Northern Hemisphere. The National Weather Service defines this as weather conditions that are sunny and clear with above normal temperatures, occurring late-September to mid-November. It is usually described as occurring after a killing frost.
The Old Farmer's Almanac has additional criteria: As well as being warm, the atmosphere during Indian summer is hazy or smoky, there is no wind, the barometer is standing high, and the nights are clear and chilly. A moving, cool, shallow polar air mass is converting into a deep, warm, stagnant high pressure system, which has the effect of causing the haze and large swing in temperature between day and night. The time of occurrence is important: The warm days must follow a spell of cold weather or a good hard frost. The conditions described above must occur between St. Martin's Day on November 11th and November 20th. For over 200 years, The Old Farmer's Almanac has adhered to the saying, "If All Saints Day' on November 1 brings out winter, St. Martin's Day brings out Indian summer."
Photograph made in Rocky Mountain National Park in northern Colorado.
Image copyright 2014 Jon Burch Photography
Uploaded
November 14th, 2014
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