Translation of the verse 2 from Surah Quraish : Number of verses 4 - - page 602 - Part 30.
(And with all those Allah's Grace and Protections for their taming, We cause) the (Quraish) caravans to set forth safe in winter (to the south), and in summer (to the north without any fear),
Their accustomed security [in] the caravan of winter and summer -
(106:2) accustomed to the journey of winter and summer, *2
*2) That is, the trade journeys. In summer the Quraish travelled northward to Syria and Palestine, for they are cool lands, and in winter southward to Yaman, etc. for they are warm.
Source : Quraish Verse 2: Their accustomed security [in] the caravan of winter and summer -