I don't understand the reason for this newgrf. It's easy as pie to set the snowline height to something higher than what can occur ingame
because as stated on wiki:
"WARNING: Some code in TTD assumes that the snow line will remain constant: Some industries are built only above/below snowline and assume that the snow line won't move when they're already built. Similarly, snowy houses on arctic will still appear snowy even when the snow disappears around them. If you want to use this feature, make sure to counter these effects by overriding arctic houses and industries with snow-aware versions."
This newgrf only substitutes graphics and is mainly considered to be ran as static grf (e.g. if you join a server with some settings, Remove Snow will still apply). Moving with snowline would cause problems with industries or servers settings, or it will overwrite one of these, so no remove of snow would happen. At least this is how I thought it works.
It is a fact that arctic without snow is sad thing, but there are people who dont like shiny snow because their eyes get hurt.