The winds noted during the world record throw were 38-42 mph.
One way to look at it is... If escape velocity was 80mph (release speed), it would take 9.33 seconds to travel 1108 feet. That's without slowing down. It is unlikely that his disc ever GAINED speed, but the tailwind allowed it to carry by reducing forward air friction dramatically. Still, he had to throw it at a trajectory and angle that it could take advantage of the wind. Not an easy thing to do. So likely, he had to have it in the air for closer to 11-13 seconds, which is pretty hard with drivers that have not a ton of air trapped underneath.
The schedule for the event is planned out MONTHS in advance. They definitely lucked out on the weather, ESPECIALLY considering they usually throw Friday to Sunday. Had that been the case, Simon may have held the title.