Fall, also known as autumn, is a beautiful season marked by changing leaves, cooler temperatures, and the harvest. But exactly which months constitute fall depends on your location and the specific definition used. While there's no universally agreed-upon start and end date, the generally accepted months for fall in the Northern Hemisphere are September, October, and November.
However, it's important to understand the nuances:
Meteorological Fall vs. Astronomical Fall
There are two main ways to define fall, each with its own set of dates:
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Meteorological Fall: This definition is based on the annual temperature cycle and divides the year into four seasons of three months each. Meteorological fall consistently spans September, October, and November in the Northern Hemisphere. This provides a standardized framework for climatological data analysis and comparison.
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Astronomical Fall (or Astronomical Autumn): This definition aligns with the Earth's position relative to the sun. Astronomical fall begins with the autumnal equinox, which typically falls around September 22nd or 23rd in the Northern Hemisphere. It then ends with the winter solstice, usually around December 21st or 22nd. This means astronomical fall can technically encompass parts of September, October, November, and December, making it slightly longer and variable year to year.
How Do Different Parts of the World Define Fall?
While September, October, and November are generally accepted in the Northern Hemisphere, the Southern Hemisphere experiences fall during March, April, and May. The seasons are reversed because of the Earth's tilt on its axis.
What Are the Defining Characteristics of Fall?
Beyond the calendar dates, several key characteristics mark the arrival of fall:
- Decreasing Temperatures: As the days get shorter, average temperatures begin a gradual decline.
- Changing Leaf Colors: Deciduous trees transform their leaves from green to vibrant shades of red, orange, yellow, and brown before shedding them.
- Harvest Season: Fall is a time of reaping the fruits (and vegetables!) of summer's labor, with many agricultural harvests taking place during these months.
- Shorter Days and Longer Nights: The days noticeably shorten as the sun's path across the sky becomes lower.
What are some common fall activities?
Fall offers a variety of enjoyable activities, depending on your location and interests:
- Leaf Peeping: Driving or hiking to admire the fall foliage.
- Apple Picking: Visiting orchards to pick your own apples.
- Pumpkin Patch Visits: Selecting pumpkins for carving or decorating.
- Hayrides and Corn Mazes: Enjoying classic fall festivities.
- Thanksgiving Celebrations: Participating in this significant harvest holiday.
When does fall officially begin?
As discussed above, the official start date of fall depends on whether you're using the meteorological or astronomical definition. Meteorologically, it always starts on September 1st. Astronomically, it starts with the autumnal equinox, around September 22nd or 23rd.
How long is fall?
Meteorological fall is always three months long. Astronomical fall varies slightly each year, but is generally longer than three months.
This comprehensive look at the months considered fall should clarify the definitions and variations depending on your perspective and location. Enjoy the beauty and activities this season offers!
