Palermo has mild winters around 46-50°F and hot, humid summers averaging 77-86°F with low precipitation. The city is located on the northern coast of Sicily, Italy's largest island, surrounded by mountains in a fertile valley ideal for growing citrus, almonds and olives. Some highlights mentioned include the post office, Plazzo del Provveditore building, Oratorio di San Mercurio church, Church of Santa Caterina and its frescoes, as well as local dishes like hashed broccoli and pasta with sardines.