MARCH AND APRIL RECORD COLD FOR CONTINENTAL USA

According to the Weather Channel ( "www.weather.com") April 2013 was the 23rd coldest in US history and March 2013 was the 43rd coldest ever. North Dakota had its coldest April on record. Six other mid-western states all had top ten coldest Aprils on record. Click here for the full report. I  had similar information two weeks ago but could not confirm the data so did not publish it. In that article it was reported that March and April, taken together was the 2nd coldest for the two month period on record. How can that be when each was only 23rd and 43rd? In the past after a month of extreme cold a month followed which was warmer than normal or vice versa. The article also stated that January through April, taken as a whole was the 20th coldest for the period in the history of weather records in the USA.