40° F (4° C)
For a freezer, the recommended temperature is much lower than that of a refrigerator. Solids freeze at different temperatures than water, so 32 degrees Fahrenheit will not be sufficiently cold.  1 Keep the refrigerator temperature at or below 40° F (4° C). 2  The freezer temperature should be 0° F (-18° C). 3  Check temperatures periodically. 4  Appliance thermometers are the best way of knowing these temperatures and are generally inexpensive. 1 Also, when putting food away, don't crowd the refrigerator or freezer so tightly that air can't circulate. 2  Keep your appliances at the proper temperatures. 3  Keep the refrigerator temperature at or below 40° F (4° C). 4 Therefore, you want your refrigerator to be cold, but not so cold that it freezes things. The preferred temperature is somewhere between 35 and 38 degrees F (1.7 to 3.3 degrees C). Anything higher and foods will spoil too quickly (it also presents food poisoning problems, as described in several of the links below). ­If you have read How Food Preservation Works, then you know that the purpose of a refrigerator is to slow down the growth of bacteria. The purpose of a freezer is to stop bacteria completely by freezing them solid. Freezer Storage. Keep your freezer at zero degrees (0°) or below to maintain the quality of frozen foods. Most foods will maintain good quality longer if the freezer temperature is -10 to -20°F. At temperatures between 0 and 32°F, food deteriorates more rapidly. Fluctuating temperatures, such as those in self-defrosting freezers, also may damage food quality. If your freezer does not have a built-in thermometer, check the temperature frequently. 1  One easy way to estimate the freezer's temperature is to check the consistency of ice cream stored inside the compartment. In order to keep food out of the Danger Zone, your fridge must be set between 32-40° F (0-4 degrees Celsius). Your freezer must be below 32° F (0° Celsius). I keep mine as cold as it will go. Keep your freezer efficient by half-filling it with bottles of water.  When it comes to protecting yourself and your family from foodborne illness, one of your most effective tools is the kitchen refrigerator. In fact, at room temperature, the numbers of bacteria that cause foodborne sickness can double every 20 minutes! Even when your refrigerator and freezer are chilling foods at the right temperatures, and you've followed all the other rules for safe storage, there are limits to how long you can safely store foods in the The ideal freezer temperature is 0 Fahrenheit (-18 Celsius) for storing food. And -10 Fahrenheit (-23 Celsius) is recommended when freezing food. The faster food freezes the smaller the ice crystals. The smaller the ice crystals the smaller the change in texture and better quality when thawed. If you want to test your freezer to see what temperature it is use a freezer thermometer. Ideally read the thermometer after the freezer door has been closed for quite awhile, like first thing in the morning, so you get an accurate reading. Keep Your Freezer Full. 1 If you do lose power, keep the doors to your fridge and freezer closed as much as possible to keep foods cold. 2  Before using any foods, check your refrigerator and freezer thermometers. 3  If the fridge is still at or below 40 °F, or the food has been above 40 °F for only two hours or less, it should be safe to eat. Even when your refrigerator and freezer are chilling foods at the right temperatures, and you've followed all the other rules for safe storage, there are limits to how long you can safely store foods in the refrigerator. Normally a domestic freezer is best set to −18 °C (0 °F) or colder, as that's what the expiration dates for many food items are based on. It's also a requirement for freezers in restaurants, supermarkets & other places that sell food (at least here in Europe) to maintain a temperature of at most -18 °C. 
http://www.ebay.com/gds/What-Temperature-Should-I-Keep-My-Refrigerator-/10000000177628314/g.html http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm093704.htm http://home.howstuffworks.com/appliances/energy-efficient/question121.htm http://food.unl.edu/refrigerator-and-freezer-storage http://lifehacker.com/what-temperature-should-you-keep-your-refrigerator-set-533534221 http://www.fda.gov/Food/ResourcesForYou/Consumers/ucm253954.htm http://www.favoritefreezerfoods.com/ideal-freezer-temperature.html http://www.fda.gov/Food/ResourcesForYou/Consumers/ucm253954.htm http://cooking.stackexchange.com/questions/4529/what-temperatures-should-i-keep-my-refrigerator-and-freezer-set-at
what is a good refrigerator temperature