• Car thermometers in the heat: Why they differ from the actual temperature

    By: Laura Mock , Ryan Love

    Updated:

    TULSA, Okla. - The heat outside and the thermometer in a car do not always get along.

    A car's outdoor temperature reading can be wildly inaccurate on hot, summer days -- often appearing much higher than the actual temperature.

    The car's thermometer temperature is measured by a thermistor located behind the car's grill.

    Thermistors have varying resistance based on the temperature.

    If a car has been sitting in the sun for a long time -- especially over concrete or asphalt -- then the temperature will appear much higher than it actually is.

    During the summer, outdoor temperature readings will not be accurate until the car has been driven for several miles, allowing air to flow over the thermistor.

    FOX23 Certified Meteorologist Laura Mock took a look at how the car thermometer temperatures can vary:


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