This is the average ambient temperature around the IOM calculated over the current sampling window defined by the intervals field, smoothing out momentary fluctuations that a single ambientTemp reading would not. It is the value an admin would trend over time to catch a slow cooling degradation that a snapshot reading might miss between polls. For example, an ambientTempAvg climbing from 30 to 38 across successive polling windows, even if individual ambientTemp spikes look unremarkable, is a clearer sign of a developing airflow problem.