I use Notepad++ as my text editing program.
The temperature may also be listed as true or false in the .js file, or even in the overall html file
could be listed as something like "list temp as C = true"
make sure you save the file the exact same way then reload onto your phone.
You might also want to double check that the weather location is correct for your specific location (within the theme files).
i know most, if not all, custom Lock Screen themes that have a weather widget I need to go in and manually change the weather location.. should be some country code then the location (ie USCA0348)