I couldn't tell the difference between 105 and 115.
OT:
Well, back in the 1990s I could. I presume I still can; however, I generally eschew really hot places like Tempe and Phoenix, AZ; thus I've not since had the "opportunity" to confirm whether I still can.
How was I able to tell? I had a project in Tempe, AZ and I, for about five minutes, stood outside on an asphalt parking lot chatting with a colleague. During that time, I felt the heat of the pavement through the soles of my shoes. The temperature was 113 degrees Fahrenheit. Later that same day, when the temp had dropped to 107, I was standing in a different parking lot for a longer period, and I didn't feel the heat coming through my shoes.
FWIW, these are the shoes I was wearing...