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* The average temperature on Everest is -19°C (0°F).
* The coldest temperature ever recorded on Everest was -62.2°C (-80°F) in July 1985.
* The warmest temperature ever recorded on Everest was 19°C (67°F) in August 2005.
* The temperature on Everest decreases by about 6.4°C (11.5°F) for every 1,000 meters (3,280 feet) of elevation gain.
Wind
* The average wind speed on Everest is 25 kilometers per hour (16 miles per hour).
* The strongest winds ever recorded on Everest were 285 kilometers per hour (177 miles per hour) in March 1983.
* The winds on Everest are strongest in the winter and weakest in the summer.
Precipitation
* The average annual precipitation on Everest is 1,750 millimeters (69 inches).
* Most of the precipitation on Everest falls in the form of snow.
* The heaviest snowfall ever recorded on Everest was 1.2 meters (4 feet) in a single day in October 1983.
Humidity
* The average humidity on Everest is 40%.
* The humidity on Everest is lowest in the winter and highest in the summer.
Weather Patterns
* The weather on Everest is constantly changing.
* The most common weather pattern on Everest is the jet stream, which is a fast-moving stream of air that blows from west to east.
* The jet stream can cause the weather on Everest to change quickly and dramatically.
* Other weather patterns that can affect Everest include cyclones, anticyclones, and fronts.
Climate Change
* Climate change is causing the weather on Everest to change.
* The average temperature on Everest has increased by about 2°C (3.6°F) since the 1950s.
* The warming climate is causing the snow and ice on Everest to melt.
* The melting snow and ice is exposing more rock, which is making Everest more dangerous to climb.