There are four seasons in a year - autumn, winter, spring, and summer. Each season lasts about three months and is characterized by changes in temperature, weather, and daylight hours. The seasons are caused by the earth's position in relation to the sun, with the seasons changing as the earth moves closer or farther from the sun. Each season has distinguishing features, such as autumn leaves changing color, winter being the coldest with snow, summer being the warmest for swimming, and spring bringing rain, flowers, and warmer weather.