Israel has two basic seasons; hot and dry from April through early October, and wet and cold from late October through March. The summer season is very predictable, with plenty of sun and high temperatures. The rainy season can be surprisingly unpredictable. We can get a week of rain and cold followed by gorgeous fall or spring like weather, with sunshine and temperatures in the 60’s or 70’s. Temperatures, humidity, wind and rain (or even snow) can vary depending on where you are in the country. In the winter months you can have great skiing conditions on Mount Hermon in the Golan Height and great snorkeling conditions down on the coral reefs in Eilat.
Summer packing should include a hat with a brim, sunblock, bathing suit, cover up, water shoes and a sweater (for air conditioned spots).
Winter packing should include a windbreaker, or similar waterproof coat with a hood ,a sweater/sweatshirt, a warm hat, scarf and one set of light weight clothes for warmer weather (you can always layer up).
Check the long term forecast before you close your suitcase!