There are only a few tips and tricks to efficiently and correctly monitoring the temperature of your computer's processor. Paying attention to a few details is sure to keep your computer processor and components in mint condition for a longer period of time and keep them from any damage caused by overheating and overclocking.
One first thing you should make sure you have enabled for proper temperature monitoring is ACPI functionality in the motherboard, setting which you can make in BIOS. In the big picture, computer and CPU temperature did not require monitoring ever since the early age of the PC, as when they were first provided for home use, no one heard of overheating. This became a problem only when people started having access to upgrading and computer reconfiguration. The systems you buy ready-made from dealers and manufacturers present a way lower risk for overclocking and overheating than the configurations you custom make yourself. In this respect you could easily avoid some of the most common overheating issues just by sticking to a manufacturer recommended configuration.
At a struggle for competitive home use computers, for newer and faster technologies, it was only at the end of the 1990's when PC and CPU temperature became a problem. Matching different technological equipment with fast running operating systems and the possibility of running endless applications revealed a threat for overheating which is sure to damage the hardware and from here on the software you use. This made it inevitable for the temperature sensors to be attached to the systems and configurations. Such a hardware piece was needed to act as a thermometer for the motherboard components and send out the readings to a software that would let you know or act up itself as to monitor and manage your overheating and overclocking problems.
CPU temperature monitoring soon became something normal as temperature monitoring sensors and software were installed from get go on the hardware which you would normally place in your PC case and the software would come free with your operating system of choice. In this regards nowdays all you have to do to actually keep an eye on your CPU or overall PC's temperature is to open a task manager which would provide you with the actual temperature inside your hardware and the one that would be desired. You can either clear some of the latent applications or give your PC a rest as to recover, all this just to safeguard your equipment from any overheating or overclocking damage.