Brian,
The short answer is that WD reported a high temp of 51.1 for the day. That erroneous temp was reported from about 10:30 PM the night before until 09:10 the next morning and at 09:11 AM, the temp went back to 25.6, which I believe was the correct temp at that time. (Looking at the monthly history, this may have been the incorrect actual temp - see history comment below) During the night, it appears the temp fluctuated up and down, but never below 45 degrees, when the actual temp was well below that (High teens/low twenties). Looking at my history, it looks like it has done this a number of times and reverts to 25.6 degrees when it clears from the high reading. As reported in my first post, I believe the WMII console was showing the correct temp and not 50.1. Will have to wait for it to happen again to confirm.
I will upgrade to the latest version and see if that makes a difference. It is not a consistent problem, so hard to track down. Thanks for the response.
John