The ideal temperature range for a refrigerator is between 35°F and 38°F (or 1.7°C to 3.3°C) . The Food and Drug Administration (FDA) recommends keeping the refrigerator temperature at or below 40°F (4.4°C) to inhibit the growth of microorganisms that can cause foodborne illnesses, such as salmonella, listeria, and E. coli. It is important to note that even a few degrees difference in temperature can significantly affect the shelf life of food. Therefore, it is recommended to use a refrigerator thermometer to ensure that the temperature is within the safe range.