I've got two batches in my fermentation freezer, with the controller set to 60 for the first couple of days, and I have one batch with US04 and another with US05.
I have the probe taped to the US04 with a piece of memory foam over it.
The US04 is 64 and the US05 is 65.
Post back what you find, but like it was said.. Some people have done it and find that there isn't much difference in the side and the core of the wort.