Jerba Island is the perfect place for enjoying summer holidays for its gold sand and crystal clear water in its tranquil beaches . It is also famous for its very hot weather that made the inhabitants from the past till now prefer painting these houses in white color to deflect the sun rays in summer . In winter , the temperature reaches below 15°C and some regions receive a huge amount of rainfall . This is the reason why most of the jerban houses are designed with domed rooftops to allow the water to run to the lower floor for using it later and making the weather cooler in summer .