However, itâs also a time to be aware of the dangers soaring temperatures can bring. Extreme heat is the number one weather-related killer in the U.S, claiming more than 650 lives across the nation each year, according to the Centers for Disease Control and Prevention.
1 In a bowl whisk together garlic, extra virgin olive oil, balsamic, 1/4 cup red wine, 1 tablespoon chopped rosemary, salt and pepper.  Place flat iron steak in a resealable plastic bag. Pour marinade over the top. Shake to coat steak in marinade. Refrigerate for 8 hours or overnight.
1 Pat steaks dry and sprinkle all over with sea salt and pepper. 2  Grill steaks on lightly oiled grill rack, covered only if using a gas grill, turning over once, until thermometer inserted horizontally 2 inches into meat (do not touch bone) registers about 120Â°F for rare, 9 to 11 minutes. Pat steaks dry and sprinkle all over with sea salt and pepper. 2  Grill steaks on lightly oiled grill rack, covered only if using a gas grill, turning over once, until thermometer inserted horizontally 2 inches into meat (do not touch bone) registers about 120Â°F for rare, 9 to 11 minutes.