brumal
cold
hibernal
hiemal
winter-blooming
winter-flowering
Siberian
aestival
algid
arctic
autumn
autumnal
below zero
biting
bitter
bitterly cold
bleak
boreal
brisk
brumous
canicular
cold as charity
cold as death
cold as ice
cold as marble
crisp
cutting
equinoctial
freezing
freezing cold
frigid
gelid
glacial
hyemal
hyperborean
ice-cold
ice-encrusted
icelike
icy
inclement
keen
midsummer
midwinter
nipping
nippy
numbing
out of season
penetrating
piercing
pinching
wintrier
wintriest
cloudless
dewy
frosty
misty
moonlit
murky
rainy
silvery
snowy
stormy
sultry
tropical
intrie
reentry