How about frostbitten reques are:

PM harn over 150
rising mist and frostbite
no fire spells.

Morning Dew
Less than 50 pm, rising mist.

early frost
more than 75 pm, frost bite

snow (person/race)
more than 150 pm, rm frb

Icey
more than 235 pm
No fire spells
rm, frb, frs, voi

blizzard
more than 250 pm
tc, frb, rm, sw