Where Should You Put an Oven Thermometer?

To check oven temperature, place an oven-safe air thermometer on the middle rack, near the centre of the oven. Once preheating is complete, take several readings a few minutes apart. The temperature can vary as the heating element cycles on and off.

Where to hang it on the middle rack

Fit the middle rack while the oven is cool. If the thermometer has a hook, turn the dial towards the door glass and hang it from a wire near the centre of the rack. Use the centre of the front edge, as shown, if that makes it easier to read through the glass. Set a freestanding model near the middle of the rack. Leave the body clear of the walls and floor. Follow the placement directions in your oven manual.

Compare readings after preheating

Set the empty oven to, for example, 175 °C. When preheating is complete, take the first reading through the glass if possible. At the same setting, look again a few minutes apart and record the readings. Wait for a consistent pattern before changing any settings. If readings repeatedly run high or low, consult the temperature-check instructions in the manual. For baked recipes such as our blueberry muffins, also follow the recipe’s rack position and signs of doneness.

Quick questions

Why does the thermometer show different readings?

The oven switches its heat on and off. Opening the door can also let heat escape. Compare several readings at the same location and setting.

Does it measure the temperature inside food?

This dial measures the air inside the oven. Use a food thermometer to measure a dish’s internal temperature.

Sources

USDA FSIS guide to appliance thermometers · ThermoWorks guide to checking oven temperature