The Four Seasons for Kids

Why Do We Have Seasons?

Many people think seasons happen because Earth gets closer to or farther from the sun. That's actually a myth! The real reason is Earth's tilt. Our planet is tilted at 23.5° on its axis. As Earth orbits the sun over the course of a year, this tilt means different parts of Earth receive more or less direct sunlight at different times — creating the four seasons.

🌍 Earth's Tilt is the Key

When the Northern Hemisphere tilts toward the sun, it gets longer days and more direct sunlight — that's summer. Six months later, when the Northern Hemisphere tilts away from the sun, it gets shorter days and less direct sunlight — that's winter. The Southern Hemisphere experiences the opposite seasons at the same time. This is why it's summer in Australia when it's winter in the USA!

The Four Seasons

🌸

Spring

March – May (N. Hemisphere)

Temperatures warm up as days grow longer and sunlight becomes more direct
Plants bloom and trees grow new leaves after the dormant winter period
Animals emerge from hibernation and baby animals are born — birds return from migration

☀️

Summer

June – August (N. Hemisphere)

The longest days of the year — the summer solstice has the most daylight hours
Hottest temperatures because sunlight hits at the most direct angle
Plants grow rapidly, insects are most active, and animals raise their young

🍂

Fall / Autumn

September – November (N. Hemisphere)

Days shorten as Earth tilts away — temperatures begin to cool
Leaves change color (green chlorophyll breaks down, revealing red, orange, and yellow pigments) and fall
Animals prepare for winter — storing food, migrating south, or preparing to hibernate

❄️

Winter

December – February (N. Hemisphere)

The shortest days of the year — the winter solstice has the fewest daylight hours
Coldest temperatures because sunlight hits at a low angle and days are short
Many animals hibernate, plants go dormant, and some regions receive snow and ice

Equinoxes and Solstices

Four special dates mark the turning points of the seasons each year:

⚖️

Spring Equinox

~March 20

Day and night are almost exactly equal length — about 12 hours each
Marks the official start of spring in the Northern Hemisphere
Sun rises exactly in the east and sets exactly in the west

🌞

Summer Solstice

~June 21

The longest day of the year — maximum daylight hours
Earth's Northern Hemisphere is tilted most directly toward the sun
The sun reaches its highest point in the sky at solar noon

⚖️

Fall Equinox

~September 22

Again, day and night are roughly equal — 12 hours of each
Marks the official start of autumn in the Northern Hemisphere
After this date, nights grow longer than days until winter solstice

🌑

Winter Solstice

~December 21

The shortest day of the year — minimum daylight hours
Earth's Northern Hemisphere is tilted most directly away from the sun
After this date, days slowly begin to get longer again

🌴 Near the Equator, Seasons Barely Change

In tropical regions near the equator — like the Amazon rainforest, the Congo, and Southeast Asia — the sun's angle barely changes throughout the year. These regions stay warm year-round and have "wet seasons" and "dry seasons" rather than four distinct seasons. Animals there don't need to hibernate, and plants don't go dormant. It's one reason the tropics are so full of life!

Season Facts

23.5°

The tilt of Earth's axis — the reason we have four seasons instead of one constant temperature

June 21

Approximate date of the summer solstice — the longest day of the year in the Northern Hemisphere

Dec 21

Approximate date of the winter solstice — the shortest day in the Northern Hemisphere

365.25

Days in a year — Earth's full orbit around the sun. The extra 0.25 days give us a leap year every 4 years

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