The astronomical system is the most traditional method. It relies on four distinct celestial events to mark the boundaries of each season. Because Earth’s orbit is not a perfect circle, the exact dates of these events can shift by a day or two each year. Spring (Vernal Equinox to Summer Solstice) Around March 19–21 End Date: Around June 20–22
is driven by the sun’s energy, which is strictly governed by the Earth’s position (Astronomical).
Summer begins when the Sun reaches its highest point in the sky, resulting in the longest day of the year. when do the four seasons start and end
Understanding why these two systems coexist helps clear up confusion when looking at calendars or weather forecasts. Astronomical Seasons Meteorological Seasons Earth's physical position relative to the sun Annual temperature cycles and calendar months Start/End Dates Variable (shifts slightly due to leap years) Fixed (always starts on the 1st of a month) Length Varies between 89 and 93 days Always exactly three full calendar months Primary Use Astronomy, navigation, traditional calendars Climate science, weather forecasting, agriculture Other Seasonal Systems Around the Globe
Winter is the coldest and darkest season of the year. In the Northern Hemisphere: The astronomical system is the most traditional method
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Starts on March 1 and ends on May 31 .
These are based on the annual temperature cycle and the Gregorian calendar. Meteorologists break the year into four three-month quarters to make record-keeping and forecasting easier. 1. Spring (The Season of Rebirth)
The four seasons are defined by two primary systems—the , which tracks the Earth's orbit and tilt relative to the sun, and the meteorological calendar , which groups months by annual temperature cycles. Spring (Vernal Equinox to Summer Solstice) Around March
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Starts December 1 and ends February 28 (or February 29 in a leap year).
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