Low relative humidity means a sub zero wet bulb temperature (dewpoint on the observations). This results in evaporation occurring at surface of the snow, sub zero temps and surface freezing occurring. Not a deep freeze like you get from cold overnight temps and softens quickly.How can the Snow Report claim:- "The snow has had a decent freeze overnight",
When the temp never even got down to Zero ° ??
This is the same effect that enables snowmaking in air temps above zero.