See comment #9 at https://bugzilla.xfce.org/show_bug.cgi?id=8105

diff -Nur xfce4-weather-plugin-0.7.4.orig/panel-plugin/weather.h xfce4-weather-plugin-0.7.4/panel-plugin/weather.h
--- xfce4-weather-plugin-0.7.4.orig/panel-plugin/weather.h	2011-02-02 14:31:29.000000000 -0600
+++ xfce4-weather-plugin-0.7.4/panel-plugin/weather.h	2011-11-08 00:23:54.948635564 -0600
@@ -21,8 +21,8 @@
 #include <libxfce4panel/libxfce4panel.h>
 #include <libxfce4util/libxfce4util.h>
 #define PLUGIN_WEBSITE   "http://goodies.xfce.org/projects/panel-plugins/xfce4-weather-plugin"
-#define PARTNER_ID       "1121946239"
-#define LICENSE_KEY      "3c4cd39ee5dec84f"
+#define PARTNER_ID       "1003666583"
+#define LICENSE_KEY      "4128909340a9b2fc"
 
 G_BEGIN_DECLS