When Do The Four Seasons Start And End -

The dates of the four seasons depend on whether you are looking at the calendar through the lens of astronomy or meteorology . 1. The Astronomical Seasons Most people are familiar with the astronomical seasons, which are based on the Earth's position relative to the sun. These start and end on specific "turning points": Spring (Vernal Equinox): March 20 or 21. This is when day and night are roughly equal in length. Summer (Summer Solstice): June 20 or 21. This is the longest day of the year. Autumn (Autumnal Equinox): September 22 or 23. Day and night are equal again. Winter (Winter Solstice): December 21 or 22. This is the shortest day of the year. Because the Earth takes about 365.24 days to orbit the sun, these dates shift slightly each year, which is why we have leap years to keep them from drifting too far. 2. The Meteorological Seasons Meteorologists and climatologists use a different system. They break the year into four three-month periods based on the annual temperature cycle and the Gregorian calendar. This makes record-keeping and data comparison much simpler. Spring: March 1 to May 31. Summer: June 1 to August 31. Autumn: September 1 to November 30. Winter: December 1 to February 28 (or 29). 3. The Hemispheric Difference It is important to remember that these seasons are reversed depending on where you live. When the Northern Hemisphere is tilted toward the sun (Summer), the Southern Hemisphere is tilted away (Winter). Therefore, while a New Yorker is starting their summer on June 21, someone in Sydney, Australia, is beginning their winter. In short, if you follow the stars and the sun , the seasons begin around the 20th–22nd of the month. If you follow weather patterns and the calendar , they begin on the 1st. Both systems provide a useful way to organize our lives around the natural rhythm of the planet.

Here’s a clear, helpful guide to when the four seasons start and end, keeping in mind there are two main ways to define them: astronomical (based on Earth’s position relative to the Sun) and meteorological (based on annual temperature cycles for record-keeping).

🌸 Spring

Astronomical (Northern Hemisphere): Starts at the vernal equinox (around March 20–21) and ends at the summer solstice (around June 20–21). Astronomical (Southern Hemisphere): Starts around September 22–23 and ends around December 21–22 . Meteorological (Northern Hemisphere): March 1 – May 31 (full months for consistent data). Meteorological (Southern Hemisphere): September 1 – November 30 . when do the four seasons start and end

🌱 Equinox = roughly equal day & night.

☀️ Summer

Astronomical (Northern Hemisphere): Starts at the summer solstice (around June 20–21) and ends at the autumnal equinox (around September 22–23). Astronomical (Southern Hemisphere): Starts around December 21–22 and ends around March 20–21 . Meteorological (Northern Hemisphere): June 1 – August 31 . Meteorological (Southern Hemisphere): December 1 – February 28/29 . The dates of the four seasons depend on

🔥 Solstice = longest/shortest day of the year.

🍂 Autumn (Fall)

Astronomical (Northern Hemisphere): Starts at the autumnal equinox (around September 22–23) and ends at the winter solstice (around December 21–22). Astronomical (Southern Hemisphere): Starts around March 20–21 and ends around June 20–21 . Meteorological (Northern Hemisphere): September 1 – November 30 . Meteorological (Southern Hemisphere): March 1 – May 31 . These start and end on specific "turning points":

❄️ Winter

Astronomical (Northern Hemisphere): Starts at the winter solstice (around December 21–22) and ends at the vernal equinox (around March 20–21). Astronomical (Southern Hemisphere): Starts around June 20–21 and ends around September 22–23 . Meteorological (Northern Hemisphere): December 1 – February 28/29 . Meteorological (Southern Hemisphere): June 1 – August 31 .