This is a gnome Shell extension that adds an applet on the panel which reveals current CPU temperature in Degree Celsius and Fahrenheit.

This extension tries to make use of the utility 'sensors' available from 'lm-sensors' package if temperature isn't available from files.
You may require to install the package if you are shown a warning to do so.
For Fedora, RHEL, CentOS and other RPM based distro:
yum -y install lm-sensors
For Debian systems:
apt-get install lm-sensors

Follow line number 201 on extensions.js if you want to see the temperature on Fahrenheit. 
The file extensions_debug.js has some debugging capabilities used during development.

Huge thanks to everyone for reporting and helping with the sensors output and letting me know which files hold the temperature information.
