indian summer
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An Indian summer is a period of unusually warm and dry weather that sometimes happens in the fall in temperate parts of the northern hemisphere. It matters because these unexpected warm spells can affect everything from how plants behave to outdoor activities and agriculture during what should normally be a cooling season.
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An Indian summer day in Fageda d'en Jordà, a beech forest located in Garrotxa county, Catalonia (Spain).
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."