In Finnish there are numerous words to describe the different forms of snow:

lumi: snow
pyry: snow shower
myräkkä: snowstorm
rae: hail
räntä: sleet
tuisku: snow shower with strong wind
laviini: a small avalanche
hyhmä: snow floating atop water
loska: very wet snow; snow, water and mud mixed together
sohjo: slush; snow and water mixed together
ahto: pack-ice (broken & refrozen ice)
ahtauma: a formation of pack-ice
jää: ice
kide: ice crystal
kohva: gray ice formed from wet snow
paanne: multi-layered ice (typically waves crash on top and freeze)
railo: pressure ridge in ice
röpelö: uneven ice
tökkö: ice with frost on top
iljanne: a thin layer of snow atop ice
hanki: a even layer of snow on the ground, esp. if enough for skiing
huurre: rime; granular frost (the white stuff in your freezer)
härmä: frost
kinos: snow drift; a loose pile of snow, esp. one formed by wind
kaljama: a thick layer of ice on the ground, lethal in the spring
kuura: hoarfrost; frozen dew
nietos: a large, hard pile of snow (may be refrozen)
nuoska: "snowballable” snow, usually formed when powdery snow melts a bit
polanne: a hard layer of compacted snow
tykky: large chunks of snow, esp. when frozen onto trees
viti: freshly fallen powdery snow
avanto: a hole in ice
jotos: reindeer tracks in snow
latu: a ski trail in snow
rannio: a reindeer path in deep snow

Sources:

➽ Wiktionary: loskakeli
➽ Welcome to my Finland, Finnish words for snow