Photoshop gurus: Two different Camera Raw windows question

[DP]

I'm trying to find the actual color temperature of some JPEG images but I open the JPEG in Camera Raw (CC 2015) and when it opens, I have a different window than when I open a RAW file! The problem is that the window only shows a plus/minus slider rather than the color temp in degrees Kelvin. If I open a RAW file, I get the actual color temp in ºK. The window that opens the RAW file has the light gray screen border while the CR window that opens for the JPEG is the default dark gray border, even tho they are both showing "Camera Raw 9.7"! I've looked in all the Preferences but see no way to show the temp in ºK.
I've opened them in CS 6, CS 5, and Lightroom CC as well. Same thing. I've converted the images from JPEG to TIFF and no change. In Bridge, there's no metadata showing the color temp.
What the heck is going on? The two different Camera Raw windows is really messing me up. It's probably something right in front of my face but I'm stumped... TIA.

[mikebw]

Perhaps the problem is that the JPEG file does not contain any real color temp data, but the RAW file does. A few years back Adobe made it possible to edit JPEG files in a similar manner to RAW because people seemed to like the way that interface worked, but the two file types are not the same.

[DP]

Perhaps the problem is that the JPEG file does not contain any real color temp data

That's probably it. There's no .xmp file along with the JPEG. Guess there's no color temp data with TIFF either.