I can’t see any way to accomplish that with this feed—there’s nothing there to say ‘this is a temperature’:
<item>
<guid isPermaLink="false">0.8899863764885236</guid>
<pubDate>Mon, 19 Mar 2007 16:36:39 GMT</pubDate>
<title><![CDATA[Current Weather Conditions In Huntsville, Canada]]></title>
<link><![CDATA[http://www.weather.com/weather/local/CAXX0648?cm_pla=city_page&cm_ite=cc&site=city_page&cm_ven=LWO&cm_cat=rss&par=LWO_rss]]></link>
<description><![CDATA[<img src="http://image.weather.com/web/common/wxicons/31/14.gif?12122006" alt="" />Light Snow, and 28 ° F. For more details?]]></description>
</item>
Am I looking at the right feed?
EDIT: RSS feeds won’t offer you what you need; you’ll want an XML feed. Weather.com offer one, but I stopped signing up when they tried to subscribe me to umpteen newsletters
so I’m not sure whether it’s what you need… LINK