LOL. I found this. Its a first hand account taken the day of the fight: "Heavy clouds were hanging low and many wore overcoats as protection against the chill wind when time was finally called at twenty-three minutes after 1 o'clock, or 1:53 New York time. Johnsons weight was announced as 227 pounds, although he looked heavier, and it was whispered that the real poundage was some fifteen pounds more. Willard's weight was 238 pounds, the announcer said." As I said before, another which Im too lazy to reproduce, stated it was slightly overcast and breezy and called it ideal weather for such an event. That, combined with the meteorological sources which put the temperature somewhere in the mid 80s, simply do not support the idea that it was blazing hot this day. Certainly not to men who werent born to air conditioning and who typically spent their most active months training and boxing outdoors to begin with. Not only is Willard's contention that it was well over 100 degrees not borne out by any verifiable first hand source but instead the actual sources that are verifiable, using both scientific data and written accounts of that day completely disagree with such a notion. Now, the ultimate point behind that story, told by Willard originally was that if Johnson had indeed taken a dive he wouldnt have waited 26 rounds in the supposedly blazing hot sun to do it. Willard used the temperature to add emphasis to his point and while he was either fibbing or misremembering his point stands. Johnson didnt take a dive. Its plain to see in the most complete versions of the film how the fight ultimately played out. Johnson started out very well and had every intention of not only winning but stopping Willard. He likely didnt fancy his chances of going 45 rounds in his condition at his age against a younger, bigger, and very strong opponent. Willard, for all of his lack of experience (relatively) and his awkwardness fought a very heady battle. He came in with a game plan, stuck to it, and executed it to perfection. He let Johnson attack, expend his energy, and often absorbed Johnsons aggression like a rock being battered by the tides. It wasnt pretty. It wasnt scientific. It was fairly simple. Often times his best defense was to simply absorb punishment because his defense was porous at best. He was outhit and outpunched for most of the fight. But he didnt waver and after about the 21st round, as his confidence grew he became more active and Johnsons terrier like flurries began to decrease in frequency, volume, and intensity. In the 25th round you can see Johnson in the film sweating profusely, unsteady at times, and very tired. His taunting had ceased and his once smiling expression was now deadly serious, worried even. In the twenty sixth watch how slowly Johnson comes out for the bell and Willard meets him and immediately lands a one-two that buckles Johnsons knees. Nobody ever mentions that. Johnson holds on and Willard is trying to get his hands free, tugging and hauling on Johnson before they are finally separated. Willard then goes back on the attack and spears Johnson with a long left that Johnson cant get out of the way of. Willard then follows up with another one-two to the body and Johnson ineffectively tries to attack but you can clearly see his arms are weak and hes tired. Willard easily catches the attack, where earlier he had been getting blistered by the same flurries, rendering it ineffective. They waltz around and when separated Willard lands a long body shot that sends Johnson into a corner. They spar for a moment and you can see Willard looking for the right hand. He sticks out a quick measuring jab and then comes over the top with the right. You can see it lands with full impact square on Johnson's jaw, snapping his head violently to the side and he goes down. Even after the count is completed Johnson is on the mat and unconscious. In some angles of Willard celebrating, after he is already standing outside of the ring ropes Johnson can be made out to be seated on a stool, still being worked over by his handlers. It was a classic knockout without a hint of controversy. After the knockout in the film there is a closeup panorama of the crowd celebrating Willards victory. All of the men have heavy 3 piece suits on which isnt necessarily unusual for the day (although in the Nelson-Gans fight film you can see men clearly removing their suit coats, wiping sweat from their brow, and even hanging towels over their heads to protect against the heat) but in one shot you can see two women fairly close to the camera, very distinguishable, and both are wearing heavy woolen coats. Not suit coats, not dress coats, but actual coats. So with all of the evidence I submit that while Johnson was indeed legitimately knocked out after a valiant effort on his part and smart bit of a fighting by Willard, it was NOT helped or hindered by incredibly hot weather.