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The lower temperature lowers the reproduction rate of bacteria, so the refrigerator reduces the rate of spoilage. A refrigerator maintains a temperature a few degrees above the freezing point of water. Optimum temperature range for perishable food storage is 3 to 5 Â°C (37 to 41 Â°F). A similar device that maintains a temperature below the freezing point of water is called a freezer. The refrigerator replaced the icebox, which had been a common household appliance for almost a century and a half. For this reason, a refrigerator is sometimes referred to as an icebox in American usage.
So exactly what temperature should a fridge be? Your fridge should be cooling food anywhere in between 36 and 40 degrees Fahrenheit (2.2 to 4.5 degrees Celsius). How do you test this? Use a probe thermometer to gauge the temperature of the inside of food that has been sitting in your fridge for at least 24 hours.