1) Weather - Thanks to the mild Mediterranean climate average temperatures in Israel are around 18 C/ 60 F in the Winter months. Perfect weather to enjoy sightseeing in the holy & historical sights, hike one of the thousands of gorgeous trails or just enjoy sitting in a cafe by the beach.
Now if you can't imagine a trip to Israel without some fun in the sun, just head South to the Dead Sea or Eilat, which is called Israel's Winter Playground.
2) Prices & Availability - With Winter being low season in Israel, chances to stay at that hotel with the incredible view is much higher, better yet, the price would be much lower than any other time of the year. Sounds like a great deal and who doesn't like that, right?! Want more? OK...airfare to Israel is almost 50% less than during Summer months.
So with low prices, mild weather, no crowds & cafe by the beach, are you ready to go?
Stay warm 
SD