Version 1.0 has been reached for the cputemp utility that uses ACPI for monitoring the CPU temperature and providing various statistics under Linux.
The open-source cputemp utility is lightweight, measures temperatures exposed via ACPI (not LM_Sensors), supports Celsius and Fahrenheit, and logs high/low temperatures too. This is just one of many open-source Linux utilities available for thermal monitoring.
More details are available from
its SourceForge project site.