In your Settings-weather.php file you have
$SITE['conditionsMETAR'] = 'KSJC'; // set to nearby METAR for current conditions icon/text
which means you are showing the icon/conditions text for MY local METAR (KSJC = "San Jose, California")
I'd suggest you change it to
$SITE['conditionsMETAR'] = 'SAAR'; // dist=49 mi (80 km), dir=NE, Rosario Airport, Argentina elev=25, dated=07-FEB-05
as your closest METAR station (80 km NE of your location).
If that station is not acceptable to you, then just comment out the line like this
// $SITE['conditionsMETAR'] = 'KSJC'; // set to nearby METAR for current conditions icon/text
and your home page will no longer try to display a condition icon/condition summary.