According to the US Food & Drug Administration* optimal refrigerated storage conditions can be achieved by following these guidelines:
Refrigeration: Maintain refrigerated storage spaces at 32-40°F to keep food safe
Freezer: Maintain freezer storage spaces at 0°F or lower to keep food safe.
*US Food and Drug Administration. Are you Storing Food Safely. http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm093704.htm