In message , John Hall
writes
In article ,
Dave Ludlow writes:
Well Carbon Dioxide snow would be first, at a bit below -78.5 deg C.

Has that ever been seen in Antarctica? I believe the lowest temperatures
recorded there aren't too far away from that value.
From a quick search, the lowest ever recorded temperature was
-129°F/-89.4°C at Vostok, Antarctica, on July 21, 1983. Cold enough for
CO2 snow!

Will
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