This read-only INTEGER reports this switch's internal temperature in degrees Celsius, read directly from an onboard sensor. Admins poll this per-switch value to catch a single overheating unit in a stack before it triggers a thermal shutdown, which matters because ambient conditions can differ between switches mounted in different rack positions. A reading climbing from a normal 45 to 68 on one switch while its stack-mates stay flat points at a fan or airflow problem specific to that unit.