I dont know when 90 degree heat became good, I shoot less when its that hot. I prefer 50-70 deg, no wind and even a bit cloudy.
I cant stand the heat anymore, mowed one day 10 yrs ago for 12hrs in 88 deg heat and got really sick from it broke out in a whole body rash, massive headache etc. Ever since then cant stand the heat, if I start to even get really hot my back starts to break out in a rash again, so Ill take cool weather any day. But have fun shooting.
 
When you’re accustomed to a thing then it’s not such a big deal. Plenty of my friends love this time of year. I know women who love the heat. Women loving the heat is one of the best things to see. It puts more women in flowing dresses and shorts in these parts. There are some that don’t enjoy it. The bugs annoy a lot of people this time of year. In fact, there’s a young woman that works at our local town store. She can’t stand the heat and says she doesn’t like tomatoes. She says she love the cold. Both are very strange to hear. It’s what I would expect a personal born in a different climate to say, but she’s from the area. I prefer spring and autumn weather, I’ll be outside regardless. I’m out there in the heat and in the snow because the animals need to eat and they need access to adequate water. What sucks is having to feed livestock in the rain and vehicles get stuck in the mud.

As for airgunning, the thing I hate about shooting in high humidity and heat is sweating all over the comb or the rear of the breech block (depending on the gun).