When Do The Four Seasons Start And End __hot__ May 2026

The Four Seasons: When Do They Start and End?

The four seasons - spring, summer, autumn (or fall), and winter - are a fundamental part of our yearly cycle. Each season brings its own unique characteristics, weather patterns, and activities. But when exactly do the four seasons start and end?

Spring

Spring is the season that marks the beginning of new life and growth. In the Northern Hemisphere, spring typically begins on:

In the Southern Hemisphere, spring starts on:

Summer

Summer is the warmest and sunniest season of the year. In the Northern Hemisphere:

In the Southern Hemisphere:

Autumn (or Fall)

Autumn, also known as fall, is the season of harvest and change. In the Northern Hemisphere:

In the Southern Hemisphere:

Winter

Winter is the coldest and darkest season of the year. In the Northern Hemisphere:

In the Southern Hemisphere:

Variations

It's worth noting that the exact dates of the seasons can vary slightly from year to year due to the Earth's elliptical orbit around the sun. Additionally, some cultures and traditions may celebrate the start of the seasons on different dates.

Conclusion

In conclusion, the four seasons - spring, summer, autumn (or fall), and winter - start and end on specific dates that vary depending on the hemisphere. Understanding when each season begins and ends can help us appreciate the unique characteristics and activities of each time of year. Whether you're looking forward to the warmth of summer or the coziness of winter, knowing when the seasons start and end can help you make the most of the year.

While the calendar on your wall gives you a specific date for the start of spring or fall, the "true" beginning of a season depends entirely on who you ask—an astronomer or a meteorologist.

Understanding the timing of the four seasons requires looking at both the tilt of the Earth and the patterns of our atmosphere. Here is everything you need to know about when the seasons start and end. 1. The Astronomical Approach (Solstices and Equinoxes)

Most people are familiar with the astronomical seasons. These are defined by the Earth's position relative to the sun. Because the Earth is tilted on its axis at roughly 23.5 degrees, different parts of the planet receive varying amounts of sunlight throughout the year.

Spring (Vernal Equinox): Starts around March 20 or 21. On this day, the sun passes directly over the equator, making day and night nearly equal in length.

Summer (Summer Solstice): Starts around June 20 or 21. This is the longest day of the year in the Northern Hemisphere, when the North Pole is tilted most directly toward the sun.

Autumn (Autumnal Equinox): Starts around September 22 or 23. Like the spring equinox, the sun crosses the equator again, signaling the transition into cooler months.

Winter (Winter Solstice): Starts around December 21 or 22. This is the shortest day of the year, marking the point when the Northern Hemisphere is tilted furthest away from the sun. 2. The Meteorological Approach (Simplified Cycles)

If you’ve ever noticed that it feels like summer in early June, even though the "official" start isn't until the 21st, you’re thinking like a meteorologist.

Scientists and climatologists use the Meteorological Calendar, which breaks the seasons into three-month blocks based on the annual temperature cycle rather than the Earth's tilt. This makes record-keeping much simpler. Spring: March 1 – May 31 Summer: June 1 – August 31 Autumn: September 1 – November 30 Winter: December 1 – February 28 (or 29) 3. Why Do the Dates Shift? when do the four seasons start and end

You might notice that the astronomical start dates move slightly from year to year (e.g., Spring starting on March 20th one year and the 21st the next). This happens because a solar year is actually 365.24 days long, not exactly 365. Our Gregorian calendar accounts for this with Leap Years, which resets the alignment and causes those minor shifts in the equinox and solstice dates. 4. The Hemisphere Flip

It is important to remember that seasons are inverted between the Northern and Southern Hemispheres. When the Northern Hemisphere is experiencing the Winter Solstice in December, the Southern Hemisphere (countries like Australia and Brazil) is celebrating the Summer Solstice.

Northern Hemisphere: Spring (March), Summer (June), Fall (Sept), Winter (Dec).

Southern Hemisphere: Autumn (March), Winter (June), Spring (Sept), Summer (Dec). Summary Table: 2024–2025 (Northern Hemisphere) Astronomical Start (2024/25) Meteorological Start Spring Summer Autumn September 22 September 1 Winter December 21 December 1

Whether you follow the stars or the thermometer, the changing seasons remain one of nature’s most predictable and beautiful rhythms.

2. Astronomical Seasons (Solar Position)

Astronomical seasons are defined by the Earth’s position relative to the Sun. Their start and end dates vary slightly each year (usually by 1–2 days) due to the leap year cycle.

Note: In the Southern Hemisphere, the astronomical seasons are reversed (e.g., their summer starts in December).

Winter (Astronomical)

What happens: The winter solstice has the fewest hours of daylight. The North Pole is tilted farthest from the sun. Ironically, this is when the "cold season" officially begins astronomically, even though many locations have already experienced freezing weather.

Why the dates shift: The astronomical dates vary because a tropical year (Earth’s orbit) is not exactly 365 days—it is roughly 365.2422 days. This is why we have leap years, which push the solstice and equinox dates by about six hours each year, causing them to land on different calendar days.

Use Meteorological Seasons when:

Closing notes — seasons and a changing climate

If you’d like: I can

The timing of the seasons depends on whether you follow the astronomical calendar (based on Earth's position relative to the sun) or the meteorological calendar (based on temperature cycles). 📅 Astronomical Seasons (2026)

These are defined by equinoxes and solstices. They usually fall around the 20th–22nd of the month. Spring: 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

Meteorologists use full months to simplify record-keeping and align with the annual temperature cycle. Spring: 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 Four Seasons: When Do They Start and End

The Orbit: Different parts of Earth receive more direct sunlight at different times of the year.

The Hemisphere: Seasons are reversed in the Southern Hemisphere. (e.g., Australia’s Summer starts in December). 🔍 Key Terms to Know Equinox: Day and night are approximately equal length.

Solstice: The day with the most (Summer) or least (Winter) daylight.

Lag of Seasons: Why the hottest day isn't until weeks after the solstice (the Earth takes time to warm up).

The start and end dates of the four seasons depend on whether you use the astronomical

calendar (based on Earth's position relative to the sun) or the meteorological calendar (based on temperature cycles and months).

National Centers for Environmental Information (NCEI) (.gov) Seasonal Breakdown for 2026 The dates below apply to the Northern Hemisphere

. For the Southern Hemisphere, these dates are reversed (e.g., March 20 marks the start of Autumn). Time and Date 1. Astronomical Seasons Astronomical seasons begin at the

. These dates vary slightly each year because Earth's orbit is not a perfect 365 days. Royal Meteorological Society

Seasons of the Year: When Do They Start and End? - Time and Date

There are actually two different ways to define the seasons: the Meteorological method (used by scientists and weather forecasters) and the Astronomical method (based on the position of the Earth relative to the sun).

Here is the breakdown of both.