Normal operating temperature for imac

I have just downloaded "temperature monitor" and it indicates the CPU is at 46c. At times the cooling fan will kick in at 26c yet currently at 46c it is not running.

Mine is about the same as yours.  You can see the "idle" speeds of my fans.  iMac i7.
Regards
Edit:  At these speeds the sound of the fan is not noticeable.  Just a little airflow coming out the vent.

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