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Spring, summer, fall (or autumn), and winter. · summer, warmest season of the year, between spring and autumn. The year is commonly divided into four seasons: · theres a lot more to summer than just vacations and hot weather. These 50 summer facts will make you even more … In the northern hemisphere, it is usually defined as the period … Because we divide a year into 12 months, … Summer or summertime is the hottest and brightest of the four temperate seasons, occurring after spring and before autumn.