My so bad! Forget I mentioned anything at all about airplanes, etc.Go back and look you said 3.C under dry conditions.
FL 40 non existent, but you said 40MASL. That acronym is meters above sea level. Once you get above 18,000’ (FL180)it changes to flight levels which eliminates variations in altimeter settings, they all use 29.92 that keeps the spacing equal, plus those are all IFR flights. Altitude and flight levels are two different things. Altitude is expressed with either MSL or AGL. So to clarify 35000’ is a flight level and is expressed as FL three five zero, not 35.
Just suffice it to say, all things being equal, as you go up hill, the temp will drop, and at 40,000FT altitude, it will be wicked cold.