The weather in Lodi is defined by cool, rainy winters with sporadic ground fog and hot, dry summers with notable daily temperature variations. Since the Sacramento-San Joaquin Delta is nearby, Lodi enjoys chilly summer nights despite having a hot-summer Mediterranean climate (Köppen Csa). In January, highs are around 55°F (13°C) and lows are around 37°F (3°C), while in July, highs are around 91°F (33°C) and lows are about 57°F (14°C). An average year has about 30.5 days with temperatures at or below 32°F (0°C) and about 65.3 days with temperatures at or above 90°F (32°C). Over around 59 days each year, Lodi averages 18 inches (46 cm) of precipitation.