Why Our Days Get Shorter As September Moves In
• Daylight hours in the U.S. decrease rapidly in September due to the Earth's axial tilt, leading to shorter days.
• Northern areas can lose up to 100 minutes of daylight in September, while Alaska may lose nearly 193 minutes.
• Shorter days often bring cooler, fall-like weather, though some northern regions may briefly experience summer warmth later in the month.
Daylight decreases due to Earth's axial tilt
As September progresses, the United States experiences a noticeable decrease in daylight hours, a phenomenon primarily attributed to the Earth's axial tilt. This tilt causes a rapid shortening of days, with the most significant changes occurring as we approach the fall equinox on September 22. During this period, the rate at which daylight diminishes is more pronounced than in any other month of the year.
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