minetest_mod_weather/weather/snow.lua

-- Snow
weather_mod.register_downfall("weather:snow",{
	min_pos = {x=-9, y=7, z=-9},
	max_pos = {x= 9, y=7, z= 9},
	falling_speed=5,
	amount=10,
	exptime=5,
	size=25,
	texture="weather_snow.png"
})

--[[local snow_box =
{
	type  = "fixed",
	fixed = {-0.5, -0.5, -0.5, 0.5, -0.4, 0.5}
}

-- Snow cover
minetest.register_node("weather:snow_cover", {
	tiles = {"weather_snow_cover.png"},
	drawtype = "nodebox",
	paramtype = "light",
	node_box = snow_box,
	selection_box = snow_box,
	groups = {not_in_creative_inventory = 1, crumbly = 3, attached_node = 1},
	drop = {}
})

--[ Enable this section if you have a very fast PC
minetest.register_abm({
	nodenames = {"group:crumbly", "group:snappy", "group:cracky", "group:choppy"},
	neighbors = {"default:air"},
	interval = 10.0,
	chance = 80,
	action = function (pos, node, active_object_count, active_object_count_wider)
		if weather == "snow" then
			if minetest.registered_nodes[node.name].drawtype == "normal"
			or minetest.registered_nodes[node.name].drawtype == "allfaces_optional" then
				local np = vector.add(pos, {x=0, y=1, z=0})
				if minetest.env:get_node_light(np, 0.5) == 15
				and minetest.env:get_node(np).name == "air" then
					minetest.env:add_node(np, {name="weather:snow_cover"})
        end
			end
		end
	end
})
]]