Standard atmosphere. At sea level, the standard atmosphere consists of a barometric pressure of 29.92 inches of mercury (“Hg) or 1013.2 millibars, and a temperature of 15 C (59 F). Pressure and temperature normally decrease as altitude increases. The standard lapse rate in the lower atmosphere for each 1,000 feet of altitude is approximately 1 “Hg and 2 C (3.5 F). For example, the standard pressure and temperature at 3,000 feet mean sea level (MSL) are 26.92 “Hg (29.92 “Hg 3 “Hg) and 9 C (15 C 6 C).
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