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Where are you getting that from the article? He seems to address that point:

> Both of these calculations are based on average temperature. Arguably what habitability depends on is be maximum temperature. If it gets unendurably hot during a summer day, the fact that winter nights are cold is little compensation.

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I'm getting it from what the author does, rather than what they say. The calculation for high temperatures is based on annual averages. The calculation for low temperatures is based on the coldest time of the year.

I had missed that sentence, but fail to see how it makes things better. It just means that the author is aware of the problem and has no excuse for using a different methodology for the two cases.

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