I am in Texas too Houston, and I don’t know what you mean by cooler than normal. We don’t ususlly have 100+ heat in June. This June has been unbearable. I am like your wife. I have been here 69 years, my whole life, and I am not accalmated to 100+ temperatures.
We’ve been between 14 and 16 degrees cooler than normal here in CT.
I am a long way from Houston. In Haskell County, and it is much dryer here, that helps. We have had almost no rainfall this year, until recently.
I think the issue is comfort not heat. 100+ is not that hot depending on where you are. Now HOT, I spent 2 weeks once in Barstow, CA., straddling the 4th of July weekend and it was 116 degrees in the shade. HOT