Obviously, we are all fumbling around in the dark on this; nevertheless, I likewise see the problem when looking at your
http://carlsbadwx.com/wxgauges.php page, but not when I look at your
http://carlsbadwx.com/gauges-ss-basic.htm page. It appears these two pages are using the identical gauges.js and other script files. I pulled down a copy of your gauges.js file and ran a comparison to mine using TextWrangler with no non preference differences found.
So if you also see the temp gauges working on your gauges-ss-basic.htm page and not on the wxgauges.php page, and it's repeatable, it would seem the issue has to be somewhere in the wxgauges.php file - how it is ordered, or something I can't see or don't understand.
Note also on the misbehaving page, not only are the temp gauges displaying ?C, but the two gauges are showing different scales. The raw temp gauge is showing 0-100, which is correct for ?F, while the other them gauge is using 0-40, which is the default ?C scale.
BTW, I do see the ?A in the gauges.js file when I look at it in Chrome, but not when I download and look at it in TextWrangler. I presume you do have the gauges.js file uploaded permanently to your site and the "realtimegaugesWC.txt" is the only file being processed and uploaded by WeatherCat.
Again, just shooting in the dark, you might consider paring down the files in your /steel directory to just those needed for the WeatherCat configuration just to be sure something there isn't causing the issue.
Rick