<Tr> <Td> Surface of Venus </Td> <Td> 9,200 </Td> <Td> 1,330 </Td> <Td> </Td> </Tr> <P> In 2008, a new weather station at about 8,000 m altitude (26,246 feet) went online . The station's first data in May 2008 were air temperature − 17 ° C (1 ° F), relative humidity 41.3 percent, atmospheric pressure 382.1 hPa (38.21 kPa), wind direction 262.8 °, wind speed 12.8 m / s (28.6 mph, 46.1 km / h), global solar radiation 711.9 watts / m, solar UVA radiation 30.4 W / m . The project was orchestrated by Stations at High Altitude for Research on the Environment (SHARE), which also placed the Mount Everest webcam in 2011 . The solar - powered weather station is on the South Col . </P> <P> One of the issues facing climbers is the frequent presence of high - speed winds . The peak of Mount Everest extends into the upper troposphere and penetrates the stratosphere, which can expose it to the fast and freezing winds of the jet stream . In February 2004 a wind speed of 280 km / h (175 mph) was recorded at the summit and winds over 160 km / h (100 mph) are common . These winds can blow climbers off Everest . Climbers typically aim for a 7 - to 10 - day window in the spring and fall when the Asian monsoon season is either starting up or ending and the winds are lighter . The air pressure at the summit is about one - third what it is at sea level, and by Bernoulli's principle, the winds can lower the pressure further, causing an additional 14 percent reduction in oxygen to climbers . The reduction in oxygen availability comes from the reduced overall pressure, not a reduction in the ratio of oxygen to other gases . </P> <P> In the summer, the Indian monsoon brings warm wet air from the Indian Ocean to Everest's south side . During the winter the west - southwest flowing jet stream shifts south and blows on the peak . </P>

What is the air pressure at the top of mount everest
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