40's to 70's, all depending on the CPU you have, since each one tends to run hotter or cooler than the other. It also pretty much depends on what "normal" is too you. If it's idling, I'd say from 40's to 50's.
Average, for a stock heatsink, but certainly not anywhere near ideal operating temperatures. The cooler a processor is, the more stable it is, and you're going to run into stability problems in the 60's.
Most aftermarket air heatsinks will get you down to between the 30's and 40's for idle and load.
Thankfully, im installing liquid cooling this month. A normal temprature should be between 30 and 60s. Mine is high because my stock fan is no match for my CPU.
😵 What CPU are you running? Intel and AMD CPU's usually automatically shut down before that point, unless it's a laptop CPU, which are rated for much higher temperatures.
That's significantly past that processor's thermal limit. =|
Have you overclocked it or something? If not, then you should clean out that heatsink. A stock heatsink shouldn't be allowing it to reach such temperatures.