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.
To sear on a gas grill, turn the temperature to high and allow the grate to heat. Place oiled steaks directly on the heated, oiled grill and cook each side for two to 13 minutes, depending on thickness. A rare, 1/2-inch steak needs only about four minutes while a well-done, 2-inch steak requires about 24 minutes.