Like KC, I can fly down to 40 F with no wind which means flying from about April 1 to November 30 here in Wisconsin.....then into the workshop where it is always 70 F and chapped skin dry humidity......

Flew my BVM F-100D mid-day today.....temp 92F, dewpoint 70F, and field elevation of 800 ft, so density altiltude was over 3000ft....really knocks off the performance of the Rhino, but still off in 400 ft of grass......if you drink enough beer and wear a 4 ft Mexi Somberero, you never notice the heat...