EDITORS NOTE: At about 13:00, Jason discusses carb icing and states 72 degrees. The answer, according to an AOPA Safety Brief,  is up to 100 degrees F at 50% humidity. Here is the link to the Safety Brief. https://www.aopa.org/-/media/Files/AOPA/Home/Pilot%20Resources/ASI/Safety%20Briefs/SB09.pdf