In New England, where the term probably originated, the warm period must follow a killing frost, and preferably after a substantial cool period. In California, Indian summer is generally any warm spell after the beginning of autumn. Indian summers do not necessarily occur every year. And there can be multiple events in any year. Wind, precipitation and temperature affect only the surface and the shallow subsurface of Earth.
Earthquakes originate many miles underground, well below the zone affected by weather.
Earthquakes occur in all types of weather, in all climate zones, in all seasons and at any time of day. Jan Null, founder of Golden Gate Weather Services, is a retired lead forecaster with the National Weather Service.