Source
Pressure from surface (0 feet) to 65,000 feet: taken from National Advisory Committee for Aeronautics Report #538, and corrected as noted below.
Pressure from 65,000 feet to 163,538 feet: taken from National Advisory Committee for Aeronautics Report #1200.
Temperatures at 1000-foot intervals, taken from National Advisory Committee for Aeronautics Reports #538 and 1200.
Geopotential Assumptions
for pressure corrections:
0 feet to 30,000 feet based upon assumed constant geopotential.
30,000 feet to 65,000 feet corrected for geopotential, by approximate correction factors. (Taken from extrapolated curve of difference in feet, from 65,000 to 100,000 feet, between N.A.C.A. table #538 (uncorrected) and N.A.C.A. Technical Note #1200 (corrected).
35,000 feet to 163,538 feet, corrected for geopotential by National Advisory Committee for Aeronautics, Note #1200.
Accuracy
Surface to 30,000 feet = 15 feet, assuming constant geopotential.
30,000 feet to 65,000 feet ±30 feet
65,000 feet to 100,000 feet ±50 feet
100,000 feet to 120,000 feet ±100 feet
120,000 feet to 135,000 feet ±150 feet
135,000 feet to 163,538 feet ±250 feet