"[log in to unmask]" <[log in to unmask]> wrote:  "As far as cold temps, even frozen water will not get colder than O deg C."   
  I agree with your conclusions but have to quibble over a technical nit that could be misinterpreted.
   
  Water does have a very high thermal capacity.  Water also transfers a great deal of heat in the act of transitioning from one phase to another.  That means the temperature will plateau for a while as it freezes.  This factor can significantly increase its capacity as a thermal buffer.  But once the water mass is solidly frozen, the temperature of the ice will again begin to fall until it matches the ambient temperature.
   
   


Mike Rossander
 
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