I think you will be okay in the temp range you listed, I would mak sure it warmed up good , it seems I heard of a 4 cycle weedeater that cracked a case flying in really cold temps though. I am not sure how much testing of this has been done, I think alot of people hang it up when it hits anything below 60 !!! Now that I think of it..there is a guy on the GP super stearman thread that only flies gas off a frozen lake all winter long...pretty sure he was using a 41 cc engine. If you look it up it seems like he had a thousand flights , or some crazy high number on his first stearmen before he lost it...