Start with your question.

Different conditions need different explanations. Follow the guide that matches your situation.

First identify the reading condition.

A rested reading can be compared with its applicable vehicle specification. Recent driving or a warmer garage adds context. Pick a guide below for the task you need, then use a model for explanation or a gauge record for actual measurements.

Three illustrated conditions: rested for at least three hours, recently driven, and rested in a warm garage. — Original schematic. Resting time and tire-air temperature are different conditions; follow the vehicle manual for the comparison you need.

01Cold or hot?What “cold” means, why driving changes a reading, and when to measure again.02Warm garage, cold outdoorsA practical plan for a warm parking space, freezing weather and a drive to the air pump.03TPMS light on?Distinguish a steady warning, an intermittent morning light and a flashing-then-steady pattern.04Winter air, summer readingsWhat cold means in summer, when to add air in winter, and what to recheck when the weather warms.05Time for a pressure checkA step-by-step gauge check with separate front, rear and spare specifications.

Need a number or a record?

The temperature calculator is a model. The check sheet is for actual readings. Neither diagnoses a tire or replaces the vehicle manual.