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Saint Luke's summer

noun usually abbreviated to: St Luke's summer
  1. a period of unusually warm weather in the autumn
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Word Origin

referring to St Luke's feast-day, Oct 7 in the pre-Gregorian calendar (now Oct 18)
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