National Oceanic & Atmospheric Administration (Database of All-Time Maximum Temperatures for the week of July 17, 2011)

(database shows that no maximum temperature records were broken in the U.S. on Jul. 17-20, and that only four out of 6,219 reporting stations broke records on Jul. 21-22 and only 10 out of 6,108 reporting stations broke records on Jul. 23).