When Does Summer Start In Canada Review

General Audience / Educational Use

Defining the Onset of Summer in Canada: Astronomical vs. Meteorological Perspectives

April 14, 2026

Canada, as a northern country with diverse climatic zones, does not have a single universal calendar date for the "start" of summer. Depending on the context—whether for astronomy, weather forecasting, or cultural tradition—the beginning of summer falls on one of two distinct dates. This paper outlines both the astronomical and meteorological definitions of summer as they apply to Canada.