It's too high for my tastes but well within Intel specs.
The why could be anything from ambient room temp, to dust in the heat sink or other air-flow issues, to a change in fan control profile, maybe even unwanted voltage bumps.
If you have two fans on your 212 with a splitter, you may have one fan not spinning but also not throwing an error. (Only one fan talks to the MB with many three pin splitters)
I would also re-apply the thermal paste if you have some handy.