CHARLES STONE assembles his new free fan provided by Project Cool at his home in San Antonio, Texas, on Tuesday. If Americans are feeling hot this week, it’s not a mirage. From Montana to Louisiana, hundreds of heat records have been slashed as harrowing temperatures leave cornfields parched and city sidewalks sizzling. On Tuesday, 251 new daily high temperature records were set, boosting to 1,015 the number of records set during the previous week. Many more records were expected to have been set Wednesday. The consequences range from comical— a bacon-fried driveway in Oklahoma — to catastrophic, as wildfires consuming parts of the Rocky Mountains are fueled by oppressive heat and gusty winds. The record-breaking numbers might seem big, but they’re hard to put into context — the National Climatic Data Center has only been tracking the daily numbers broken for a little more than a year, said Derek Arndt, head of climate monitoring at the center. Still, it’s impressive, given that records usually aren’t broken until the scorching months of July and August.