It lasts until the summer solstice (the longest day of the year) in June. The Meteorological Definition: Following the Calendar
Because plants and animals respond to local temperatures, phenological spring can "arrive" weeks earlier in a warm valley than on a nearby mountaintop. Key Characteristics of the Spring Season spring definition season
Longer days trigger photosynthesis in plants, leading to a sudden explosion of green across the landscape. It lasts until the summer solstice (the longest