Autumn (also known as fall in North American English) is one of the four temperate seasons,the transition from summer into winter.In the temperate zones,autumn is the season during which most crops are harvested,and deciduous trees lose their leaves.It is also the season where days rapidly get shorter and cooler,and of gradually increasing precipitation in some parts of the world.
Autumn is often defined as the start of the school year,since they usually begin in early September or early March).Either definition,as with those of the seasons generally,is somewhat flawed because it assumes that the seasons are all of the same length,and begin and end at the same time throughout the temperate zone of each hemisphere.