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Old 5th Jan 2021, 05:57
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TopBunk
 
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As an aside, I recall flying over Siberia in winter probably about 15 years ago.

We were in a B744 @ FL370 or so. The SAT outside was pretty much standard ISA at about -56degC, the temperature on the ground at Irkutsk (or wherever) was -57deg C!
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