CPU temperatures disappear from thermal sensor dashboard widget

[Colt45]

This is a pretty minor thing, but I logged into one of my boxes and thought the intel coretemp driver was broken. But they I realized that it was reporting but the temperatures were in the range of -1C to 0C. Once one of the cores spiked to 2-3C and the green bar displayed enough to see the white characters.
I fixed it by going to a dark theme.
But I thought a couple ways would be to prevent the green bar from disappearing completely or shifting the text the a different color if it was under a certain amount.
The attached picture show what it was the following day. 2C is about the lowest it will display without characters disappearing.