You didn't say whether those temps were idle or at full load or what. I would assume they are probably midrange since you said "as of time of writing" or something like that.
I also noticed you said your old PC did the same thing when it was in the same location as your current machine. to me, this suggests maybe some type of interference, or as suggested before the line voltage is not sufficient. incoming line voltages in the US can vary anywhere from 95vac-130vac. If there are other devices on the same circuit as the PC, it could be causing a problem. To solve this, you can either not use the appliaces causing interference, or you can use a line conditioner, which would be a good idea as well if you are having drops and surges in the line voltage.