The four seasons by month are: Spring (March, April, May), Summer (June, July, August), Autumn/Fall (September, October, November), and Winter (December, January, February) in the Northern Hemisphere. These months are reversed in the Southern Hemisphere, where summer starts in December and winter in June.
Why Seasons Occur
Seasons are caused by the Earth’s axial tilt of about 23.5 degrees, not by its distance from the Sun. As Earth orbits the Sun, the tilt causes different hemispheres to receive more direct sunlight at different times of the year. When the Northern Hemisphere tilts toward the Sun (around June), it experiences summer, while the Southern Hemisphere tilts away and has winter. Six months later, the situation reverses. The equinoxes (around March 20 and September 22) mark the moments when day and night are nearly equal, while the solstices (around June 21 and December 21) mark the longest and shortest days of the year.
Meteorological vs. Astronomical Seasons
There are two common ways to define seasons: astronomical and meteorological. Astronomical seasons are based on the Earth’s position relative to the Sun, starting at the solstices and equinoxes. Meteorological seasons are based on the annual temperature cycle and are divided into three-month blocks for easier record-keeping. The table below summarizes the differences for the Northern Hemisphere:
- Astronomical Spring: from the spring equinox (March 20-21) to the summer solstice (June 20-21)
- Astronomical Summer: from the summer solstice (June 20-21) to the autumn equinox (September 22-23)
- Astronomical Autumn: from the autumn equinox (September 22-23) to the winter solstice (December 21-22)
- Astronomical Winter: from the winter solstice (December 21-22) to the spring equinox (March 20-21)
Meteorological seasons are simpler: Spring is March, April, May; Summer is June, July, August; Autumn is September, October, November; Winter is December, January, February. Most weather services and climate scientists use meteorological seasons because they align with the calendar and temperature patterns.
Seasons in the Southern Hemisphere
The Southern Hemisphere experiences opposite seasons. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. The months are:
- Spring: September, October, November
- Summer: December, January, February
- Autumn: March, April, May
- Winter: June, July, August
This is why countries like Australia and Argentina celebrate Christmas during their summer, and why the Antarctic winter (June to August) is the coldest period on Earth.
Seasonal Weather Patterns and Daylight
Each season brings distinct changes in temperature and daylight. In summer, the Sun is higher in the sky, and days are longer, leading to warmer temperatures. In winter, the Sun is lower, days are shorter, and temperatures drop. Spring and autumn are transitional periods with moderate temperatures and variable weather. The exact timing of these changes varies by latitude: near the equator, seasons are less pronounced, and many tropical regions have wet and dry seasons instead of the four temperate seasons.
Cultural and Mythological Associations
Many cultures have mythologies tied to the seasons. In Greek mythology, Persephone’s annual return from the underworld marks spring, while her descent in autumn brings winter. In Norse mythology, the god Freyr is associated with summer and fertility. In Hindu tradition, the seasons (Ritu) are linked to deities and festivals, such as Vasant (spring) honoring Saraswati. In Shinto, the changing seasons are celebrated through festivals like Hanami (cherry blossom viewing) in spring. These stories reflect humanity’s long-standing observation of seasonal cycles.
How Seasons Affect Daily Life
Seasons influence agriculture, clothing, energy use, and even health. Farmers plant and harvest based on seasonal temperatures and rainfall. People adjust their wardrobes and heating/cooling needs. Seasonal affective disorder (SAD) is a type of depression linked to reduced daylight in winter. Many cultures hold seasonal festivals, such as the summer solstice celebrations in Scandinavia or the autumn harvest festivals in East Asia. Understanding the months for each season helps with planning travel, events, and outdoor activities.
Common Misconceptions
A frequent misconception is that seasons are caused by the Earth’s distance from the Sun. In fact, Earth is closest to the Sun in early January, during Northern Hemisphere winter, and farthest in early July, during summer. Another misconception is that the equinoxes have exactly 12 hours of day and 12 hours of night everywhere; due to atmospheric refraction, daylight is slightly longer. Also, some people think seasons are the same worldwide, but the Southern Hemisphere’s opposite timing proves otherwise.
Frequently Asked Questions
What months are in each season?
In the Northern Hemisphere, spring is March to May, summer is June to August, autumn is September to November, and winter is December to February. In the Southern Hemisphere, these are shifted by six months.
Why do seasons start on different dates each year?
The astronomical start dates vary because the Earth’s orbit is not exactly 365 days, so the solstices and equinoxes can occur on different dates (e.g., March 20 or 21). Meteorological seasons always start on the first of the month.
Do all countries have four seasons?
No. Tropical regions near the equator often have wet and dry seasons instead of spring, summer, autumn, and winter. Polar regions have long winters and short summers, while some temperate areas have distinct four-season patterns.
How do seasons affect animal behavior?
Many animals migrate, hibernate, or change their coats based on seasonal cues like temperature and daylight. For example, birds fly south in autumn, bears hibernate in winter, and some animals breed in spring when food is abundant.
What is the difference between solstice and equinox?
A solstice occurs when the Sun reaches its highest or lowest point in the sky, marking the longest and shortest days of the year (summer and winter solstice). An equinox occurs when the Sun is directly above the equator, making day and night nearly equal (spring and autumn equinox).
Related
- Hunter x Hunter Seasons: Complete Watch Order
- Jody of Southern Seasons: Origins, Lore & Meaning
- Kansas Hunting Seasons: Dates & Species
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