The Proto-Indo-European word *sneigʷh-
Word *sneigʷh-
Meaning snow
See also Homeric Greek: νίφα ‘snow’
Greek: νίφα ‘snow’
Ancient Macedonian: νίβα ‘snow, spring’
Avestan: snaēžā ‘snow’
Synonyms *ĝheim-

Comments
Lith. sniegas, Ltv. sniegs, Old Prussian snaygis, Russ. sneg, Ir. snechta/sneachta, Skr. snēha, Eng. snāw/snow, Gk. nipha, Gm. sneo/Schnee, ON snjór, Goth. snaiws, Polish śnieg, Welsh nyf, Av. snaēža, Toch. /śiñcatstse

Other words that might be of interest
*h₂stḗr ‘star’, *méh₁-nōt ‘moon, month’, *nebʰ-o-, nebʰ-i- ‘cloud’, *sneudh- ‘cloud, mist’, *séhₐul ‘sun’, *h₃meigh- ‘drizzle, mist’, *nébʰes- ‘mist, cloud, sky’, *(s)kand- ‘shine, glitter, moon’, *louksnehₐ- ‘moon’