Question

the boiling point of water is lower at high altitude. Give reason ?

Answer 1

Boiling. At sea level, water boils at 100 °C (212 °F). For every 500-foot (150 m) increase in elevation, water's boiling point is lowered by approximately 0.5 °C. At 8,000 feet in elevation, water boils at just 92 °C 
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Answer 2

At higher altitudes, air pressure is lower. When atmospheric pressure is lower, such as at a higher altitude, it takes less energy to bring water to the boiling point. Less energy means less heat, which means water will boil at a lower temperature at a higher altitude.

Hence; water can freeze....

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