November last

Today the temperature will hit the mid 60s. I borrowed the following from the American Meteoroligical Society:

"An early American writer described Indian Summer well when he wrote, "The air is perfectly quiescent and all is stillness, as if Nature, after her exertions during the Summer, were now at rest." - John Bradbury

Indian Summer Definition
The American Meteorological Society's Glossary of Weather and Climate defines Indian summer as:'A time interval, in mid- or late autumn, of unseasonably warm weather, generally with clear skies, sunny but hazy days, and cool nights'."
In New England, at least one killing frost and preferably a substantial period of normally cool weather must precede this warm spell in order for it to be considered a true "Indian summer." It does not occur every year; and in some years two or three Indian summers may occur."