It is possible to ride the Israel all year round, perhaps except with the exception of winter due to rains, and that is not a fact. It all depends on what type of recreation is planned. If this is a sightseeing holiday, then the best time is the late autumn and early spring, because in the summer it is fiercely inspecting sights. Although those who rest on the beaches are still chosen and do not regret. But if we are talking about a beach holiday rest, then on the Mediterranean Season lasts from May to October (and sometimes until the end of October), while on the Red Sea, in particular in Eilat it is year-round.
The temperature of the water is almost never falling below 20 degrees. True, in the winter period, the air temperature can be tested, which, though rarely, can descend to 15 degrees. The situation is similar and the dead sea.
Despite the fact that the sea in the winter can be a bit cool (+ 19-20 degrees), and in the summer through Chur warm (+ 30-35), you can still take a spa treatments in the pools to enjoy the healing air.
If the question is from the point of view, and when it is cheaper to relax in Israel, it is worth noting that in the case of Israel, the concepts "high" and "low" season are fully working. Spring is considered a high season due to temperature comfort and autumn for the same reason, plus such holidays as a Jewish new year and a feast of a feath that attract a large number of tourists falls on autumn.
Low season can only be called summer due to suffocating heat, but winter, although the rainy is not considered. The reason is concluded in a large influx of pilgrims on religious holidays.
Of all this we can conclude that it is cheaper to rest in the summer. But low cost and comfort, concepts are often incompatible.