Over the past week, much of the U.S. felt an early arrival of springtime temperatures. Over the 7 day period from March 9-15, 2012 2,441 heat records fell across the country. Nine hundred and ninety nine of those were nighttime high temperatures, and an amazing 1,803 were daytime high temperatures. The relative location and frequency of the record-breaking temperatures are shown in this image, where red colors indicate daytime records and yellows indicate nighttime records. In co-occurring locations, the daytime heat records frequency is shown.