Dictionary.com Word FAQs
Should I capitalize the names of seasons, such as Spring and Summer?
The seasons of the year are not capitalized as a rule, except in some literature like in poetry when a season is personified. However, it is certainly ok to capitalize the names of the seasons, especially when doing so often makes it clearer that you are talking about a season. Spring is the first season of the year, astronomically from the vernal equinox to the summer solstice. In the US, it is generally thought of as March, April, and May. Spring's etymology is from Old English as 'the place of rising or issuing, esp. of a stream, river, etc.' The second season, Summer, is astronomically from the summer solstice to the autumnal equinox and the word's history goes back to Old Norse sumar, though the word has cognates outside Germanic languages. Autumn, the third season, is astronomically from the autumnal (descending) equinox to the winter solstice, popularly September, October, and November. Autumn derives from Latin autumnus. The term Fall is used in North America as the ordinary name for Autumn; in England it is rare except in literary use and some dialects. Winter, the fourth season, extends astronomically from the winter solstice to the vernal equinox and is considered to be December, January, and February. Winter's etymology goes back to Gothic wintrus.