I have known for years that hot weather cannot make a human being melt. Everyone I personally know realizes that hot weather cannot make a human being melt.
Quit trying to prove it to us, okay? It's only June for your sake. If you make it this hot now, what are you going to do for August?
Unless, of course, you are really trying to melt humans. Not a bad idea. Then you can start out again with creatures who are more gentle, and more caring of each other and the rest of the world's creatures. Like badgers.
However, if you are planning on wiping out the human race, be somewhat merciful. Just send down the fire from the sky and have it all be over in seconds. None of this slow cooking. Cause you know... it really sucks.