The date at which each season begins depends on how it is defined. In the United States, the seasons are often considered to begin at the astronomical solstices and equinoxes: these are sometimes known as the "astronomical seasons". By this reckoning, summer begins at summer solstice, winter at winter solstice, spring at the vernal equinox and autumn at the autumnal equinox.

In the United Kingdom, the seasons are traditionally considered to begin about seven weeks earlier: spring begins on Candlemas, summer on May Day, autumn on Lammas, and winter on All Hallows. Accordingly, midsummer and midwinter are, as their names suggest, the middle of summer and winter. The Irish calendar uses almost the same reckoning; Spring begins on February 1 / Imbolc, Summer on May 1 / Beltane, Autumn on August 1 / Lughnasadh and Winter on November 1 / Samhain.

In meteorology for the Northern hemisphere, spring begins by convention on March 1, summer on June 1, autumn on September 1 and winter on December 1. This definition is also followed in Denmark and former USSR. Conversely, for the Southern hemisphere, meterological summer begins on December 1, autumn on March 1, winter on June 1 and spring on September 1. This definition is also followed in Australia.

~ http://en.wikipedia.org/wiki/Season

March for Minnesota is historically the month with the greatest snowfall. However today in southern Minnesota winter storms seem far away with temps in the upper 40s (F). On New London's Mill Pond the ice is clearly in retreat. Notably though in Northern Minnesota a winter snowstorm rages with total expected accumulations in some parts of the State of 7 inches or more.