Real Temp and Core Temp are something which report accurate temps. Dont worry about the 30 deg. Its fine. Just after i boot, Real Temp shows my E8400 gets a reading of 7 deg and another 10 deg for the two cores!
I assume you meant to say 'inaccurate temps'. If that is the case, then Im still in the dark to knowing my what my cpu temp is. I could only expect a idle temp of 30c if I had a good cooling setup, but with the stock hsf im using, it seems temps like those are impossible to come by.
While I have no accurate way to report my ambient temps, all I know is my room temp has to be cooler than the 25c outside. As for load temps, I dont push my processor hard and not until recently began to monitor temps. Since then I've been keeping it lightly, but then again I usually do that regardless.