Snowmaking has dramatically affected the skiing industry. Resorts rely on snowmaking to prepare the trails as soon as it is cold enough and to keep them open all season regardless of natural snowfall. Pump operators create snow by mixing water with highly compressed air. Using pumps, valves, hoses and special nozzles operators cover the ski trails with fresh snow. They move the equipment and maintain it. They also groom finished snow. Snowmaking generally runs from November to April, however resorts often start hiring in August. Snowmakers must be physically fit. Experience with heavy equipment, farm machinery, or pumps and valves can help. They put in long shifts, but may have days off to enjoy winter sports and resort perks. Snowmakers often work at night and always in cold temperatures. Yet, for someone who enjoys the clear mountain air and beautiful rural setting and access to the slopes on their days off, snowmaking offers its own special rewards.