Seasons are periods in a year marked by specific weather conditions, temperatures and divide the year in 4 seasons: spring, summer, fall (autumn) and winter. See what's in season with this handy guide to fall fruits and vegetables -- from apples to winter squash. Autumn (British English) or fall (American English) is one of the four temperate seasons. Autumn marks the transition from summer to winter, in September. Escarole is another chicory at its best in fall and winter. Free content Linking Lookup box. Tomatillos look like small green tomatoes with a light green papery husk. Like the natural world that he observes, he too has reached his prime and now must look forward to the inevitability of old age and death. This view is presented in English poet John Keats ' poem To Autumnwhere he describes the season as a time of bounteous fecundity, a time of 'mellow fruitfulness'.