It is important to note that many Americans also recognize astronomical seasons, which begin on the equinoxes and solstices (around March 20, June 21, September 22, and December 21). However, the meteorological system (grouping full months) is more practical for climate tracking, farming, and daily planning. Consequently, when most people refer to "US season months," they mean the March–May (spring), June–August (summer), September–November (autumn), and December–February (winter) framework.
Depending on the context, Americans use two different methods to categorize months into seasons: Meteorological Months (Weather-Based) Astronomical Dates (Position of Sun) March 1 – May 31 Late March (Equinox) to late June Summer June 1 – August 31 Late June (Solstice) to late September Fall September 1 – November 30 Late September (Equinox) to late December Winter December 1 – February 28/29 Late December (Solstice) to late March us season months