Abstract: Preparatory to its supply to snow horns, high-pressure liquid CO.sub.2 flows through a heat-exchanger where it is cooled by R-13 refrigerant, reducing the temperature of the high-pressure liquid to about -60.degree. F. at normal use rates. R-13 refrigerant is compressed and condensed against R-502, which is in turn compressed and condensed at ambient air temperature. Subcooled liquid CO.sub.2 at about 300 psig. provides an additional 7 weight percent snow over such liquid at 0.degree. F. A control system on each snow-making apparatus monitors the temperature of the subcooled liquid CO.sub.2 just upstream of expansion devices at the snow horns, and depending upon the temperature which is sensed, the control system changes the duration of time that liquid CO.sub.2 is supplied to a snow-making hood to assure a metered quantity of CO.sub.2 snow.