Winter hikingThere are no major problems to hike in Winter - December to late February. Make sure you have proper rain gear.
North to south or south to north is probably the same.
In the north when it rains you'll have mud . Rain in the south is rare. When it rains in the desert you can expect
flash floods. Make sure you are updated with the forecast and avoid crossing a flash flood.
For very fit and fast hikers :
Starting in the north has the advantage of arriving in Arad in top shape. It allows covering longer distance/day
in the desert and avoiding some or all the water caches.
Daily weather forecast