David was speaking symbolically.
The Lutheran Study Bible explains David's meaning of "snow" this way: "Figurative for sun-bleached bones or glittering equipment of slain enemies lying on the darker hillsides" (Edward A. Engelbrecht (ed.), page 911)
The Pulpit Commentary: Psalms. Vol. 2. gives a similar account of the phrase "white as snow in Salmon" by "conclud[ing] that something must have fallen out. Professor Cheyne supplies כְּמוֹ הַשֶּׁלֶג, “like snow,” and understands the passage to mean that, when the kings were scattered, “it was like snow when it snows on Salmon”—the ground was all covered with glistering arms, armour, and garments. Salmon was a wooded hill near Shechem (Judg. 9:48)" (Spence-Jones (ed.), page 44).
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