2, 1996 to 114 °F (46 °C) at Moorhead on July 6, 1936) Fahrenheit (span of 96C°; from -51 °C to 45 °C). [ 24 ] Meteorological events include rain , snow, blizzards, thunderstorms, hail, derechos , tornadoes , and high-velocity straight-line winds . The growing season varies from 90 days per year in the