National Climate Report - April 2012
April Temperature Records
At least 332 locations in the U.S. had a daily warm temperature which was the warmest on record for April. Not only were many monthly records broken, but many of them were broken by a large margin — well over 1 degree Fahrenheit. Plotted in this image are the locations of the broken records for the highest monthly maximum temperature during April, along with shades of red indicating by how much the record was broken. Many of these records were concentrated in the Rocky Mountains and Southern Plains. Texas alone accounted for over 50 of these records. To note: for highly populated areas, there may be more than one automated surface observation station (ASOS) whose values are averaged to form a single grid point (pixel).
After a decade of warmer than average Aprils in the U.S., few highest monthly maximum temperature records for April remain from the 20th Century. This image plots the decade in which the highest average April temperature record was set for different regions of the country, starting in 1911 (i.e., 1911-1920) and running through 2010. The records broken in 2011 and 2012 are shown separately. Most of the pixel colors are associated with the 2001-2010, 2011 and 2012 time periods. Gray indicates no data (records) are associated with that area of the country.