Oxygen freezes at 55 K, so at normal pressure
it's liquid from 90 K down to there,
an unusually long liquid range.

Gaseous hydrogen can be cold enough to freeze oxygen.
It goes liquid at 20.3 K, and freezes at 14 K.
Liquid helium is much colder still.


--- G.R.L. Cowan, former hydrogen fan
Boron: internal combustion, nuclear cachet --
http://www.eagle.ca/~gcowan/Paper_for_11th_CHC.html