E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The second summer, or the summerly time which sets in about All-Hallows-tide. Called by the French, Lété de St. Martin (from October 9th to November 11th). Also called St. Lukes Summer (St. Lukes Day is October 18th). The Indian summer. Shakespeare uses the term