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Saint Martin's summer

noun
  1. mild, warm weather similar to Indian summer, occurring in November.
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Origin of Saint Martin's summer

First recorded in 1585–95; from the occurence of such weather around the feast of St. Martin, celebrated on November 11
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for saint martin's summer

Saint Martin's summer

noun usually abbreviated to: St Martin's summer
  1. a period of unusually warm weather in the late autumn, esp early November
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Word Origin for Saint Martin's summer

referring to St Martin's feast-day, Oct 31 in the pre-Gregorian calendar (now Nov 11)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012