This has puzzled me for a couple of years, hesitant to ask because it might be borderline ridiculous but since it is the same story in CS6 and new Bridge/Camera Raw, I just have to ask. Every thing I have seen (books, tutorials, videos) shows the temperature (under Basic and just beneath White Temperature) as a 4 digit number. Mine is just -100 to 100. No 4 digits. I am not so silly that I don't understand that I get a full range of temperatures available (it is all relative. I get that). But it is making me crazy that everyone else on the planet appears to have 4 digits and I don't. Does anyone know why this is so for me? Not quite up there with how they get the caramel in the Caramilk Bar but truly an itch I am dying to scratch.
The behavior you are describing is what happens when you open JPEG images in ACR. To get the full range of temperature values you have to be working on raw images.
Bless you, bless you, bless you! I am so pleased to know the answer!