VIDEOClick to see full answer. Simply so, how do you calculate air temperature?NASA supplies a formula that calculates the expected stratospheric temperature (T in degrees C) given the global average temperature of -57 degrees C at 25 km altitude. The formula is T = -131 + (0.003 * altitude in meters).Likewise, what determines how much air parcel will cool? As a rising parcel cools, its relative humidity increases. Once the relative humidity reaches 100% (determined when the parcel temperature cools down to its original dew point temperature), further lifting (and cooling) results in net condensation, forming a cloud. Secondly, what is parcel temperature? 33° C. 3° C. No. The first thing to do is move the parcel upward until it cools to its dew point temperature or reaches saturation with respect to water vapor. Rising parcels that are unsaturated cool at a rate of 10° C per 1000 meters they are lifted.How do you calculate temperature using lapse rate?In this question, initial altitude or height = 0 km, final altitude = 12 km, initial temperature = 12 degrees C and final temperature = -54 degrees C. Thus, the lapse rate is -5.5 C/km, that is with each km rise in altitude, the temperature will fall by 5.5 degrees C. = 12 + 2 x -5.5 = 12 – 11 C = 1 degrees C.