Figure 7-14 Temperature and Pressure in the Venusian Atmosphere The pressure at the Venusian surface is a crushing 92 atm (1296 lb/in2). Above the surface, atmospheric pressure and temperature decrease smoothly with increasing altitude. The temperature decreases from a maximum of nearly 750 K (900°F) on the ground to a minimum of about 173 K (−150°F) at an altitude of 100 km.