The official statistics for May were published recently by the National Climatic Data Center. The precipitation contrasts across the lower 48 states was remarkable last month.
Nearly all the northern tier of states from the Pacific northwest to New England finished with well above average precipitation, whereas, the southern tier of states from New Mexico to Florida all finished with well below normal rainfall. In fact, only a handful of states finished with near average precipitation during May. It was definitely a feast or famine month for rainfall.
Some parts of far western North Dakota experienced the wettest May on record, but as a whole, May 2011 finished as the 12th wettest on record for the state. Minnesota was not quite as wet and ended up with the 30th wettest May since 1893.
By average, the wettest states last month were Montana, Wyoming and Utah. Both Wyoming and Utah had their 2nd wettest Mays on record with Montana recording their 3rd wettest.