Seasons Dates — The 4

The fixed dates of the meteorological system are vital for climatology, agriculture, and commerce. They allow scientists to compare seasonal weather statistics consistently without the shifting dates of the astronomical calendar. For example, calculating "summer average temperatures" is statistically more accurate if the period is strictly defined as June 1 through August 31.

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The are determined by two primary methods: the astronomical calendar, based on Earth's position relative to the sun (equinoxes and solstices), and the meteorological calendar, which follows the annual temperature cycle . In the Northern Hemisphere for 2026, Astronomical Spring begins on March 20 , followed by Summer on June 21 , Autumn on September 22 , and Winter on December 21 . Seasonal Start Dates (Northern Hemisphere) : A popular premium brand found in international

While astronomical seasons are determined by the position of the Earth relative to the Sun, meteorological seasons are based on the annual temperature cycle and the civil calendar. This system was developed to simplify the statistical calculation of weather data, as the "thermal lag" (the delay between maximum sunlight and maximum temperature) means the hottest days often occur weeks after the summer solstice.

Meteorological seasons are consistent every year and consist of three full months each: