What does 'outside' mean on tires?

[AlanDella]

In cars, 'outside' refers to the external temperature. Here is a detailed explanation of the external temperature: 1. When a car displays 'outside' followed by a number, it generally indicates the current external temperature. When the outdoor temperature is below 4 degrees, it alerts you that the external environment is cold, and there may be icy roads, reminding the driver to pay attention to driving safety and avoid sudden braking to prevent danger. 2. 'Outside' in a car refers to the external temperature, reminding that the outdoor temperature is lower than the interior temperature, and suggesting the driver to turn on the heater to prevent window fogging. 3. The external temperature sensor, also known as the ambient temperature sensor, is usually installed near the front bumper or grille. Its sensing element uses a negative temperature coefficient thermistor. The detection method for the external temperature sensor is the same as that for the coolant temperature sensor, and its resistance can be measured with a multimeter in resistance mode—the lower the temperature, the higher the resistance.