Does my CPU Temperature Seem Low to You?

It got really hot for the first time in my home today. In the past, my Mid 2010 iMac has had some trouble with the so I went to check my fan speed/CPU temp and I was surprised to se a temperature reading of 32°F, also known as the temperature where water freezes. This is obviously inaccurate since it is 94° in my house right now.

Any one know how I might fix this? I have already reset the PRAM to no effect.