Snowmaking creates snow by dispersing water and air-under-pressure into freezing ambient air. They can even choose whether to make it into light powder or a wet base snow (which lasts better at higher temperatures) by regulating the water content of man made snow. Still, the lower the temperature, the better for snowmaking. It usually needs to be below 25 degrees fahrenheit (-3.89 Celsius) for it to work, which is part of the reason it is done at night. The lower the humidity, the higher the temperature can be. Aaah… the miracles of modern science….