My fav is that it is hot enough to fry an egg on the sidewalk. I saw a newscast in Dallas during a previous summer where they actually cracked an egg on the pavement and it actually began to fry.
Last summer I left Alexandria, LA on the 19th of July and the heat index was 113. I drove home, caught up on paperwork the next day, then the next left bound for northern Minnesota on vacation. On the 22nd of July, I walked out on the boat pier with a cup of coffee at 6:15 in my gym shorts, tank top, ball cap and flip-flops and it was 57 degrees. I thought I had died and gone to Heaven. Nearly a 50 degree swing in temps for me in less than 48 hours! What a deal.
Funny how peoples attitude change in such a short time. Here we are complaining about the heat, when less than 30 days ago it had rained nearly every day for over a month. The rivers and lakes were overflowing and the temps were unseasonably mild. I remember watching fireworks on the 4th from my normally scorching back patio. Kids swimming in the cement pond and actually enjoying it.
Gonna be another scorcher today here in the south. I just heard my A'C unit come on for the day. It fired up about 10:30 yesterday and didn't turn off 'till 'bout 9:45 last night.