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What is the average barometric pressure on the summit of Mount Washington?

April 26, 2017average Barometric mount washington pressure Summit

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What is the average barometric pressure on the summit of Mount Washington?

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The average barometric pressure on Mount Washington is roughly 23.66 inches of mercury; a typical sea level pressure would be 29.92 inches of mercury. Therefore, there is about 20% less air (by mass) on the summit than there is in the valley.