Not news to most at this point, but March was warm. At Konza, our first flowering phenologies were running 30 days ahead. Upper Midwest was even more extreme in temperatures.
I'm writing this just to post the maps...
This NASA depiction of land-surface temperature anomalies between March 8 and 15 shows the effects of the Great Warm Wave kicking off across the Great Plains of the United States and central Canada. In some areas, the land surface was more than 18°F (10°C) warmer than average. (Image courtesy NASA Earth Observatory.)
Another map for March:
This is for March 2012, departure from normal (1980-2011).