What appened to the "Nats"

I have been about 6 times. I always enjoyed it, but it was always hot. The last time I went, it was over 100 degrees with a ridiculous heat index. By 2:00, I was done and left. I could not stand the heat any longer. I was absolutely drenched with sweat. I was in my car with the AC on max for several hours and drank a ton of liquids before I felt better. That was probably 15 years ago.