winterly
brumal
overwinter
winterish
prewinter
winterlong
snowful
winterful
snow-covered
snowsure
niveous
glacial
subnivean
cold as balls
cold as a well-digger's arse
cold as a witch's kiss
snowlike
cold as death
cold as a witch's tit
brass monkey
cold as ice
bone-chilling
frosty
chillish
snowswept
undersnow
snow-clad
taters
snowy
taters in the mould
chilling
cold enough to freeze the balls off a brass monkey
chanking
Baltic
brick
wintry
bust ass cold
perishing
wintery
nivean
snowclad
algid
freezing
frore
brass monkeys
oversnowed
blizzardous
coldish