In a warm biome such as mesa, desert, jungle and savanna, snowmen die of heat. Putting them in a block of powder snow should avoid the over heating, yey it doesnt

I expected them not to die while encased in snow that even freezes the player and mobs

Yet they do

Steps to Reproduce:
0. Be in a hot biome (jungle, desert, mesa, savanna)
1. Put a block of powder snow on a surface
2. Build a snowman above it, so that when it spawns, it falls into the powder snow
3. The snowman melts for the heat