In my experience, when one of the Weather Gadgets works, they all do.
Try creating a new one and setting the location to Raleigh, WV (25871).
The current temp is 4°C.
The ...\Windows Sidebar\Cache\168522d5-1082-4df2-b2f6-9185c31f9472 folder has
_wc-USWV0620Fde-DE_.xml which contains:
<CacheFile>
<Version>1.0</Version>
<SavedTime>130722664586979150</SavedTime>
<ExpiryTime>130726984586979150</ExpiryTime>
<Data><?xml version="1.0"?>
<weatherdata
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<weather
weatherlocationcode="wc:USWV0620"
weatherlocationname="Raleigh, USA" zipcode=""
url="http://www.msn.com/de-de/wetter/heute/Raleigh,West-Virginia,Vereinigte-Staaten-von-Amerika/we-city-37.771,-81.249?ctsrc=Windows7"
imagerelativeurl="http://wst.s-msn.com/i/de/" degreetype="F" provider="iMap"
attribution="Daten wurden bereitgestellt von iMap"
attribution2="© iMap"
lat="37.77135" long="-81.24862" timezone="-4" alert=""
entityid="10037915" encodedlocationname="Raleigh%2c+USA">
<current temperature="39" skycode="31" skytext="Wolkenlos" date="2015-03-31"
observationtime="04:51:00" observationpoint="Beckley, Raleigh County Memorial Airport"
feelslike="39" humidity="55" winddisplay="6 mph SSW" day="Dienstag" shortday="Di" windspeed="6"/>
<forecast low="35" high="61" skycodeday="30" skytextday="Teilweise bewölkt" date="2015-03-31"
day="Dienstag" shortday="Di" precip="0"/>
<forecast low="43" high="57" skycodeday="34" skytextday="Weitgehend sonnig"
date="2015-04-01" day="Mittwoch" shortday="Mi" precip="0"/>
<forecast low="57" high="71" skycodeday="11" skytextday="Schauer"
date="2015-04-02" day="Donnerstag" shortday="Do" precip="40"/>
<forecast low="43" high="68" skycodeday="4" skytextday="Gewitter"
date="2015-04-03" day="Freitag" shortday="Fr" precip="60"/>
<forecast low="32" high="52" skycodeday="11" skytextday="Schauer"
date="2015-04-04" day="Samstag" shortday="Sa" precip="20"/>
<toolbar timewindow="60" minversion="1.0.1965.0"/>
</weather>
</weatherdata>
</Data>
</CacheFile>
Try that and see if it works.
T.