Both systems are verified and valid. The key is knowing which one you’re using. For consistent, month-by-month planning, the meteorological calendar wins. For marking the exact moment when daylight tips in our favor, the astronomical calendar is your guide.
Begins around June 20 (Summer Solstice) and ends around September 22. Verified Months: June, July, August. Autumn (Fall) Meteorological: September 1 to November 30.
Because the Earth tilts away from the sun on one end while tilting toward it on the other, the Southern Hemisphere experiences completely reversed seasons: March, April, May Winter: June, July, August Spring: September, October, November Summer: December, January, February The Astronomical Calendar (Based on Earth's Orbit) months for the seasons verified
A critical aspect of verifying months for seasons lies in the history of the Roman calendar. Our current months are named after numbers (September = 7, October = 8, November = 9, December = 10). Yet, they currently serve as the 9th, 10th, 11th, and 12th months.
Ultimately, both the astronomical and meteorological seasons are valid, but they serve different purposes. The are tied to the celestial dance of our planet and the Sun, marking the solar calendar that has guided humanity for millennia. The meteorological seasons , however, are a triumph of applied science. By grouping months into fixed, temperature-based blocks, they provide the clean, consistent, and practical framework required for modern data analysis, forecasting, and the study of our changing climate. When you see the month ranges for a season "verified" by a scientific source, it is almost certainly the meteorological definition being used to provide the most accurate and comparable picture of our planet's climate. Both systems are verified and valid
Begins around December 21 (Summer Solstice) and ends around March 20. Verified Months: December, January, February. Autumn (Fall) Meteorological: March 1 to May 31.
3. Autumn (Fall): September – November (September, October, November) For marking the exact moment when daylight tips
| | Months (Northern Hemisphere) | |:---:|:---:| | 🌼 Spring | March, April, May | | ☀️ Summer | June, July, August | | 🍂 Autumn (Fall) | September, October, November | | ❄️ Winter | December, January, February |
A summary view showing the "Months Verified" metric.
Once, the Earth had no schedule. Snow would fall on blooming roses, and heatwaves would strike in the middle of a frost. To fix the chaos, Father Time called the twelve months together to assign them to the .