June, July, and August are the three warmest months of the year for most locations. June 1 is a clean, non-varying date that allows weather agencies to compare seasonal data year-over-year without leap year adjustments.
The next time someone asks you, "When does winter start?" you can confidently reply: "Astronomically on December 21 or 22, but meteorologically on December 1. Which system would you like to use?" when do the four seasons start and end
In 2026, the four seasons start and end on different dates depending on whether you use the (solstices and equinoxes) or meteorological (full months) definition. Northern Hemisphere Seasons (2026) Astronomical Dates Meteorological Dates Spring March 20 – June 20 March 1 – May 31 Summer June 21 – September 22 June 1 – August 31 Autumn September 23 – December 20 September 1 – November 30 Winter December 21 – March 19, 2027 December 1 – February 28, 2027 Southern Hemisphere Seasons (2026) Astronomical Dates Meteorological Dates Autumn March 20 – June 20 March 1 – May 31 Winter June 21 – September 22 June 1 – August 31 Spring September 23 – December 21 September 1 – November 30 Summer December 22 – March 19, 2027 December 1 – February 28, 2027 Key Differences June, July, and August are the three warmest
Since astronomical dates vary slightly, here are the specific start dates for 2024 and 2025. Which system would you like to use
The Autumnal Equinox , falling on September 22 or 23 . Astronomical End: The Winter Solstice (around December 21). Meteorological Dates: September 1 to November 30.
The four seasons are defined by two primary systems—the , which tracks the Earth's orbit and tilt relative to the sun, and the meteorological calendar , which groups months by annual temperature cycles.
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