The ideal temperature for a refrigerator is 40 degrees Fahrenheit (4.4°C) or below, according to the U.S. Food and Drug Administration (FDA) . This temperature inhibits the growth of microorganisms that can cause foodborne illnesses, such as salmonella, listeria, and E. coli. However, Consumer Reports recommends a slightly lower temperature of 37°F (2.8°C) to keep fresh food good for as long as possible, with no ice crystals on lettuce or bacteria breeding in raw meats. Its important to note that even when refrigerators have digital controls for setting precise temperatures, the settings aren’t always accurate. Therefore, its recommended to use a refrigerator thermometer to ensure that the temperature is at the desired level. The freezer should be set at 0 degrees Fahrenheit (-18°C) to properly store food and prevent the growth of bacteria.