If you visited Mount Shasta City (elevation 900 m [3,000 ft]) and found the outside air temperature to be 27C (81F), what would the air temperature at the summit of Mount Shasta (elevation 4200 m [14,000 ft]) at that moment - - assuming that the temperature conditions with altitude change at an average, or normal lapse rate?

5.9C, (42.6) F

Explanation:

The temperature at height above ground level is given as

temperature at height above ground level = Ground Temperature - (height difference * average laps rate)

where average laps rate = 6.39c/km

The following data are given data were given

Shasta city elevation=900m=0.9km

summit elevation = 4200m=4.2km

Hence the height differences is 4.2km-0.9km

Hence the height differences=3.3km

Using the formula

temperature at height above ground level = Ground Temperature - (height difference * average laps rate)

we arrive at

temperature at height above ground level = 27 - (3.3*6.39)

temperature at height above ground level = 5.913 C

converting to Fahrenheit

(5.913*9/5) + 32=42.6F