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Check refrigerator and freezer temperatures with thermometers

Use independent thermometers to check that the fridge stays at or below 4°C and the freezer is about −18°C.

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A dial setting is not an actual temperature reading. The US FDA advises keeping refrigerators at 4°C (40°F) or below and freezers at −18°C (0°F), verified with appliance thermometers. Safe food storage also depends on time and cross-contamination prevention.

Your try-it-at-home checklist

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Put one appliance-rated thermometer in the refrigerator and another rated for the freezer.
Aim for at most 4°C (40°F) in the refrigerator and −18°C (0°F) in the freezer; also check model-specific guidance.
Position the thermometers where they are easy to read and record readings at least weekly. Do not judge performance from a reading taken just after leaving a door open.
If readings are too warm, look for overcrowding, blocked air vents or a door that does not seal; adjust controls according to the manual.
Keep raw meat and seafood contained on a low shelf to prevent dripping, and refrigerate perishable foods promptly.
After a power failure or cooling fault, do not rely on odor or appearance; use the time and measured temperature to follow the FDA's food-safety guidance.

Your try-it-at-home checklist

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