Currently the snow biomes don't keep snowing, so if you cleared the snow away from the spawn, it should "desnowify" until the biome gets fixed. If you don't want your spawn point in a snow biome, then a mod to change the spawn point (such as Hey0), or a level editor would be your other choice. You can also just delete your world and restart the server to generate a new one. Chances are good you won't be in a snow biome again.
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Snowy Maps