A record-smashing heat wave occurred in March 2012, breaking numerous record highs across the US. The extreme heat affected various regions, including the Central and Eastern US, as well as the West, with some areas experiencing drought and wildfires. The heat wave had a significant impact, with over 180 cities recording their hottest March on record, and prompted safety precautions ahead of the July 4 holiday, although it is unclear if the holiday was actually affected since the heat wave occurred in March.