Table 1-6.—U.S. Standard Atmosphere Heights and Temperatures HEIGHTS TO STANDARD PRESSURE AND TEMPERATURE Altitude, feet Pressure, hPa inches Temperature, °C °F 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 16,000 17,000 18,000 19,000 20,000 21,000 22,000 23,000 24,000 25,000 1013.2 29.92 977.2 28.86 942.1 27.82 908.1 26.82 875.1 25.84 843.1 24.90 812.0 23.98 781.8 23.09 752.6 22.22 724.3 21.39 696.8 20.58 670.2 19.79 644.4 19.03 619.4 18.29 595.2 17.58 571.8 16.89 549.2 16.22 427.2 15.57 506.0 14.94 484.5 14.34 465.6 13.75 446.4 13.18 427.9 12.64 410.0 12.11 392.7 11.60 376.0 11.10 15.0 13.0 11.0 9.0 7.1 5.1 3.1 1.1 -0.8 -2.8 -4.8 -6.8 -8.8 -10.8 -12.7 -14.7 -16.7 -18.7 -29.7 -22.6 -24.6 -26.6 -28.6 -30.6 -32.5 -34.5 59.0 55.4 51.9 48.3 44.7 41.2 37.6 34.0 30.5 26.9 23.3 19.8 16.2 12.6 9.1 5.5 1.9 -1.6 -5.2 -8.8 -12.3 -15.9 -19.5 -23.9 -26.6 -30.2 Altitude, feet Pressure, hPa inches Temperature, °C °F 26,000 359.9 27,000 344.3 28,000 329.3 29,000 3 14.8 30,000 300.9 31,000 287.4 32,000 274.5 33,000 262.0 34,000 250.0 35,000 238.4 36,000 227.3 37,000 216.6 38,000 206.5 39,000 196.8 40,000 187.5 41,000 178.7 42,000 170.4 43,000 162.4 44,000 154.7 45,000 147.5 46,000 140.6 47,000 134.0 48,000 127.7 49,000 121.7 50,000 116.0 10.63 10.17 9.72 9.30 8.89 8.49 8.11 7.74 7.38 7.04 6.71 6.40 6.10 5.81 5.54 5.28 5.04 4.79 4.57 4.35 4.15 3.96 3.77 3.59 3.42 -36.5 -33.7 -38.5 -37.3 -40.5 -40.9 -42.5 -44.4 -44.4 -48.0 -46.4 -51.6 -48.4 -55.1 -50.4 -58.7 -52.4 -62.2 -54.3 -65.8 -56.3 -69.4 -56.5 -69.7 Constant to 65,500 feet STANDARD PRESSURE SURFACES Pressure surface, hPa Height, feet meters Temperature °C °F Pressure surface, hPa Height, feet meters Temperature, °C °F 1000 200 925 150 850 100 700 70 500 50 400 30 300 20 250 364 2,512 4,781 9,882 18,289 23,574 30,065 33,999 111 766 1,457 3,012 5,574 7,185 9,164 10,363 14.2 10.0 5.5 -4.7 -21.3 -31.7 -44.7 -52.4 57.8 50.0 41.9 23.5 -6.3 -25.1 -48.5 -62.3 38,662 44,647 53,083 60,504 67,507 78,244 86,881 10 101,885 11,784 13,608 16,180 18,442 20,576 23,849 26,481 31,055 -56.7 -70.1 -56.7 -70.1 -56.7 -70.1 -56.7 -70.1 -55.8 -68.4 -52.7 -62.9 -49.9 -57.8 -45.4 -49.7 1-63