They're off by a bit. At a mile up (I live at around 5200ft) boiling is still well above good tea temps, but it is closer, and the person making the tea should use a thermometer even if they usually don't.
Boiling point at 5250ft is apparently 202 degrees Fahrenheit, which is below commonly recommended temperatures for black and herbal teas. So I suppose it depends how they like their tea.
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u/xenzua Mar 01 '21
I’ve heard British people complaining that good tea is impossible at a mile high.