I'd suggest you replace the WCTtags.php template with a fresh one from the WCT-plugin.zip.
You need to have a separate directory for the template v.s. the processed webpage version. The WCTtags.php in the template directory should have contents like ...
$rawdatalines = <<<END_OF_RAW_DATA_LINES
CT|CT$|// Current temperature, temperature units and hourly change in brackets.:|:
CD|CD$|// Current dew point, dew point units and hourly change in brackets.:|:
CWC|CWC$|// Current wind chill, wind chill units and hourly change in brackets.:|:
CX|CX$|// Current wind direction and units.:|:
...
If it looks like ...
$rawdatalines = <<<END_OF_RAW_DATA_LINES
CT|62.7°F (0.6)|// Current temperature, temperature units and hourly change in brackets.:|:
CD|54.7°F (-0.1)|// Current dew point, dew point units and hourly change in brackets.:|:
CWC|62.7°F (0.6)|// Current wind chill, wind chill units and hourly change in brackets.:|:
...
then the WCTtags.php template has been processed already and that one set of values will show on your website. That can happen if the template and website directories are the same (the first processing of the tags modifies the template and so the WeatherCat tags are removed and replaced with values rendering the template file useless).