Different cultures define autumn by traditional events:
This definition stays consistent every year, making it easier for scientists to compare weather patterns over decades. 3. The Phenological Start: Nature’s Cues
The answer depends on your purpose:
If you are an astronomer or a pagan celebrating Mabon, autumn starts precisely at the equinox. If you are a climatologist or paying your heating bill, it starts on September 1. But if you step outside, take a deep breath of crisp air, and notice the slant of the golden afternoon light, you’ll know the real answer: For most of the temperate world, that moment arrives sometime in mid-to-late September, though its official entry on the calendar will always be a subject of friendly debate.
After the equinox, the days continue to get shorter and the nights longer until the Winter Solstice in December. when is autum
Autumn, also known as fall, is one of the four seasons in the year. It is the season that comes after summer and before winter. The exact dates of autumn vary depending on the location and the hemisphere.
If you aren't looking at a calendar, you might determine when autumn starts based on —the study of periodic biological phenomena. For many, autumn hasn't truly arrived until: Different cultures define autumn by traditional events: This
You might notice the equinox date shifts slightly between the 22nd and 23rd of September. This happens because a solar year (the time it takes for Earth to orbit the sun) isn’t exactly 365 days—it’s about . Our calendar accounts for this with Leap Years, which causes the timing of the equinox to reset and shift slightly over time. 5. What to Expect During Autumn
Historically, autumn is the season of the harvest. This is why many cultures celebrate festivals like Thanksgiving or Mid-Autumn Festival during this period. If you are a climatologist or paying your
This is the most traditional and widely cited definition. Astronomically, autumn begins with the in the Northern Hemisphere and the vernal (spring) equinox in the Southern Hemisphere.