When Does Autumn Begin? Fall Start Date

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As the days grow shorter and a crispness fills the air, many eagerly anticipate the arrival of autumn. But when exactly does this beloved season begin?

Defining the Start of Autumn

There are two primary ways to define the start of autumn:

  • Meteorological Autumn: This definition marks September 1st as the first day of autumn. Meteorologists divide the year into four seasons based on temperature cycles, with each season spanning three months. This makes it easier for record-keeping and comparisons.
  • Astronomical Autumn: This definition is based on the Earth's position in its orbit around the sun. Astronomical autumn begins with the autumnal equinox, which usually falls on September 22nd or 23rd in the Northern Hemisphere.

The Autumnal Equinox

The autumnal equinox is the moment when the sun crosses the celestial equator, an imaginary line in the sky above the Earth's equator. On this day, day and night are approximately equal in length. After the autumnal equinox, the days become shorter than the nights in the Northern Hemisphere, signaling the progression into fall.

What to Expect in Autumn

Regardless of which definition you prefer, autumn is a season of change and beauty. Here’s what you can typically expect:

  • Falling Leaves: Deciduous trees begin to shed their leaves, creating colorful landscapes.
  • Cooler Temperatures: Average temperatures gradually decrease, bringing relief from the summer heat.
  • Harvest Season: Many fruits and vegetables ripen during the fall, making it a time of abundance.
  • Changing Daylight: Days get shorter, and nights get longer as we move closer to winter.

Celebrating Autumn

Autumn is a popular time for outdoor activities, such as hiking, apple picking, and visiting pumpkin patches. Many cultures also celebrate autumn with festivals and holidays, like Halloween and Thanksgiving.

Whether you follow the meteorological or astronomical definition, autumn is a season to be enjoyed. Embrace the changing colors, cooler temperatures, and the cozy atmosphere that this time of year brings. Get outside and enjoy a walk in the crisp air, or cozy up indoors with a warm drink and a good book. Autumn offers something for everyone.