I believe that the seasons run:
Winter: Nov/Dec/Jan - Spring: Feb/Mar/Apr - Summer: May/Jun/Jul - Autumn: Aug/Sep/Oct
Winter: Dec/Jan/Feb - Spring: Mar/Apr/May - Summer: Jun/Jul/Aug - Autumn: Sep/Oct/Nov
I am one of the people Wikipedia describe, that believes that Winter runs from Winter Solstice to Spring Equinox, and I am willing to be identified as such despite being clearly wrong.
PS Autumn = Fall, sorry US readers.
PPS Sorry readers below the equator for the upper-centric terms.