When Do The Four Seasons Start And End

The exact dates when the four seasons start and end depend entirely on whether you look at the calendar through an astronomical lens or a meteorological lens. While astronomers base the seasons on the position of the Earth relative to the sun, meteorologists use the annual temperature cycle and the civil calendar to group months together.

On the vernal equinox, the sun crosses directly over the Earth's equator. Day and night are nearly equal in length (about 12 hours each). After this point, the Northern Hemisphere begins to tilt toward the sun, leading to longer days and warming temperatures.

These are defined by equinoxes and solstices. They usually fall around the 20th–22nd of the month. March 20 – June 20 (Spring Equinox) Summer: June 21 – September 21 (Summer Solstice) Autumn: September 22 – December 20 (Fall Equinox) Winter: December 21 – March 19 (Winter Solstice) 🌡️ Meteorological Seasons

Starts at the Winter Solstice (December 20, 21, or 22) and ends at the Vernal Equinox (March 19, 20, or 21). when do the four seasons start and end

When a hemisphere tilts toward the Sun, light hits it at a steep, direct angle, concentrating the heat energy and creating summer. When it tilts away, the sunlight strikes at a shallow angle, spreading the same amount of energy over a much larger area, resulting in winter. Summary of Start and End Dates ✅ Astronomical Dates (Northern Hemisphere)

Because Earth’s orbit is not perfectly circular, the exact times and dates of the solstices and equinoxes shift slightly by a day or two each year. 2. The Meteorological System

Meteorologists use full months to simplify record-keeping and align with the annual temperature cycle. March 1 – May 31 Summer: June 1 – August 31 Autumn: September 1 – November 30 Winter: December 1 – February 28 (or 29) 🌏 Why Do They Happen? The Tilt: Earth is tilted at 23.5 degrees . The exact dates when the four seasons start

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

The summer solstice is the longest day of the year. The North Pole is tilted maximally toward the sun. While many consider this "mid-summer," astronomically, it marks the beginning of summer. Day length slowly decreases after this point.

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Starts December 1 (Meteorological) or December 20–22 (Astronomical). Ends February 28/29 or March 19–21.

Why they matter

Note: For the Southern Hemisphere, the seasons are reversed (e.g., Summer in the Northern Hemisphere is Winter in the Southern Hemisphere). Why Do They Differ?

While the astronomical definition of the seasons is based on the Earth's position in its orbit, the meteorological definition is based on the annual temperature cycle. The meteorological seasons are defined as: