My screwed up interpretations of the seasons based on California weather and the public school year looks like the following:
Spring: February, March, April, May
Summer: June, July, August
Fall: September, October, November
Winter: December, January
Winter doesn't really exist though and is mostly just included so people don't complain about it's absense. Spring is sort of different from fall/summer but it is mostly just a less-hot summer. Furthermore, summer doesn't start until June 15 or so when school gets out.