Method canSnowAt

src/main/java/net/minecraft/world/World.java:2745–2772

Checks to see if a given block can accumulate snow from it snowing @param pos The block coordinates @param checkLight If false, checking for the correct light values will be skipped

(BlockPos pos, boolean checkLight)

     * @param checkLight If false, checking for the correct light values will be skipped
     */
    public boolean canSnowAt(BlockPos pos, boolean checkLight)
    {
        BiomeGenBase biomegenbase = this.getBiomeGenForCoords(pos);
        float f = biomegenbase.getFloatTemperature(pos);

        if (f > 0.15F)
        {
            return false;
        }
        else if (!checkLight)
        {
            return true;
        }
        else
        {
            if (pos.getY() >= 0 && pos.getY() < 256 && this.getLightFor(EnumSkyBlock.BLOCK, pos) < 10)
            {
                Block block = this.getBlockState(pos).getBlock();

                if (block.getMaterial() == Material.air && Blocks.snow_layer.canPlaceBlockAt(this, pos))
                {
                    return true;
                }
            }

            return false;
        }
    }

    public boolean checkLight(BlockPos pos)
    {