wintery
wintry
Siberian
aestival
algid
arctic
autumn
autumnal
below zero
biting
bitter
bitterly cold
bleak
boreal
brisk
canicular
cold
cold as charity
cold as death
cold as ice
cold as marble
crisp
cutting
equinoctial
freezing
freezing cold
frigid
gelid
glacial
hibernal
hiemal
hyperborean
ice-cold
ice-encrusted
icelike
icy
inclement
keen
midsummer
midwinter
nipping
nippy
numbing
out of season
penetrating
piercing
pinching
raw
rigorous
seasonal
severe
sharp
brume
brumous