Close
Perhaps the most "interesting" definition of spring comes from ecology, where calendars matter less than biology. This is often referred to as .
: It consists of three full calendar months. In the Northern Hemisphere, this is March, April, and May Ecological (Phenological) Spring : Defined by biological indicators rather than dates. spring definition season
This definition is fluid. It depends on latitude, altitude, and soil temperature. A true biological starts when the average daily temperature reaches a specific threshold (often 50°F or 10°C) for several consecutive days—a phenomenon known as "green-up." Perhaps the most "interesting" definition of spring comes
Spring is defined as the temperate season occurring between and summer . It is characterized by rising temperatures, lengthening daylight, and the "awakening" of nature. In the Northern Hemisphere, this is March, April,
Depending on who you ask, the "start" of spring varies based on three primary systems: Astronomical: Defined by the Earth's orbit. It begins at the vernal equinox (when day and night are nearly equal) and ends at the summer solstice Northern Hemisphere: ~March 20 to June 21. Southern Hemisphere: ~September 22 to December 22. Meteorological: