The problem has to do with what goes into the <span> with the ID "ajaxcurrentcond".
The PHP code currently sets it to "mostly clear".
<td align="center" style="text-align: center; border: 1px solid gray;">
<span class="ajax" id="ajaxcurrentcond">
mostly clear </span><br/><br/>
</td>
When the javascript runs (via ajaxWDwx3.js as "check-fetch-times.php?view=wx" reveals), it gets changed to "Dry".
<span class="ajax" id="ajaxcurrentcond" lastobs="Dry" style="">Dry</span>
So you need to find a) What data (from the tags) is used to set the condition for the PHP code and b) what realtime data is used to overwrite it in the js code. I don't have the WD code or I'd check on it.