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Old 11.02.2016, 13:19
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Re: Escaping Zurichsee fog

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Fair enough. Kathmandu is at 1,400m, so when it was -9° there in January three years ago, it must have been -59° at the summit of Mt Everest. Clearly, your scientifically rigorous method is pretty much as accurate as mine.
The coldest ever recorded on the summit is -41ēC.

Kathmandu is too far away. You need to work from the temperature of the base camps.

Googling:

Quote:
Basecamp temperatures reflects summit temperature with an expected +1ēC per 150 meter of altitude drop.
From here
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