رِحْلَةَ الشِّتَاءِ وَالصَّيْفِ
The journeys of winter and summer. (106:2)
Winter and summer are contrasting seasons. The wāw coordinates them as parts of one recognized pattern of travel. There is therefore an intelligible jāmiʿ: both are seasons specifying the same activity.
This does not mean that every contrast functions identically. Here the seasonal relation, shared syntactic dependence and economic context jointly make coordination apt.