snow

Boyd’s Bible Dictionary:

Only mentioned once as actually falling
(2 Sam. 23:20; 1 Chron. 11:22); but of frequent poetic and metaphoric use (Ex. 4:6; Num. 12:10; 2 Kings 5:27; Psa. 51:7; Isa. 1:18).

Concise Bible Dictionary:

Snow
This is taken in scripture as a symbol of “whiteness.” The sins as scarlet become as white as snow; the raiment of the Lord in the transfiguration was as white as snow (Psa. 51:7; Isa. 1:18; Lam. 4:7; Dan. 7:9; Matt. 28:3; Rev. 1:14).
Snow on Mt. Hermon

Strong’s Dictionary of Greek Words:

Greek:
χιών
Transliteration:
chion
Phonic:
khee-one’
Meaning:
perhaps akin to the base of 5490 (5465) or 5494 (as descending or empty); snow
KJV Usage:
snow