Why do climbers only try to go up mt. everest during a specific period of the year? (site 1)

Climbers scale Mt. Everest in May due to 3 reasons: Wind, snow and temperature. For most of the year, winds of almost 100 miles per hour blast on the summit and can kill a person in minutes or even blow them away. It is only at the start of the Asian Monsoon that the wind dies down. This gives climbers a 7 to 10 day window to climb the mountain. Also, the temperature is normally warmer during this time of the year.
September is also a month that the wind slows down but during this period, snow falls so it is too cold to climb.

Ibelieve the answer is water and oil.