Why Israel's seasons matter.
Three things make timing in Israel consequential. First, the country's compact geography compresses radical climate variety. Jerusalem in the Judean hills (800 meters elevation) has cool winters with occasional snow and warm dry summers (averaging 9 °C overnight in January, 30 °C daytime in July). Tel Aviv on the Mediterranean coast has mild Mediterranean winters (13 °C overnight in January) and hot humid summers (28 °C average July). The Dead Sea and the Negev Desert in the south have a desert climate (cool winters with dramatic temperature swings, intensely hot summers reaching 40+ °C). Eilat in the far south on the Red Sea has the country's hottest summers and warmest winters, sea swimming year-round. The country's rainy season runs October through May (the Mediterranean coast and northern Israel get most of their rain November–February); summers are essentially rain-free. Second, Israel's iconic cultural moments are firmly calendar-locked according to the Jewish lunar calendar. Passover (Pesach) in March or April brings the country's biggest internal-tourism period, Jewish families travel within Israel, hotels in Tel Aviv and Eilat sell out. Rosh HaShanah (Jewish New Year) in September or October is the start of the Jewish High Holidays. Yom Kippur (10 days after Rosh HaShanah) is the country's most distinctive day, virtually all secular activity stops, no cars on the streets (children ride bicycles in the empty streets, a Yom Kippur tradition), and even airports operate at reduced capacity. Sukkot (the Jewish harvest festival, 5 days after Yom Kippur) brings family gatherings in Sukkah temporary booths. Hanukkah in December is widely observed. Purim (February or March) brings carnival-style celebrations. Christmas in Bethlehem (December 24–25) draws Christian pilgrims; the Greek Orthodox Easter (varying date, typically a week or two after Western Easter) brings major Holy Week observances at the Church of the Holy Sepulchre. Tel Aviv Pride (typically the second Friday of June) is one of the world's largest Pride parades. Ramadan (varying with Islamic calendar) brings major celebrations in the country's Arab Israeli communities (Nazareth, Acre, Old City Jerusalem). Third, Shabbat (the Jewish Sabbath), from Friday sunset to Saturday sunset, has practical implications: most Jewish-owned businesses, public transport (including most bus and train services), and many restaurants close. Tel Aviv has more Shabbat-active businesses than Jerusalem. Plan for Shabbat impact on transportation and dining.