Lodi has cool, wet winters, often characterized by dense ground fog, and very warm, dry summers. According to the Köppen climate classification system, Lodi has a hot-summer Mediterranean climate . Due to the city’s proximity to the Sacramento-San Joaquin Delta, summer temperatures usually dip into the fifties at night. Fog and low overcast sometimes drifts in from San Francisco Bay during the summer and it can be breezy at times, especially at night.
Average January temperatures are a maximum of 55 °F (13 °C) and a minimum of 37 °F (3 °C). Average July temperatures are a maximum of 91 °F (33 °C) and a minimum of 57 °F (14 °C). There are an average of 65.3 days with highs of 90 °F (32 °C) or higher and an average of 30.5 days with lows of 32 °F (0 °C) or lower. The record high temperature was 111 °F (44 °C) on June 15, 1961. The record low temperature was 11 °F (−12 °C) on January 11, 1949.
Annual precipitation averages 18 in (46 cm), falling on an average of 59 days. The wettest year was 1983 with 35.4 in (90 cm) and the driest year was 1976 with 7.18 in (18.2 cm). The most rainfall in one month was 15.01 in (38.1 cm) in January 1911. The most rainfall in 24 hours was 3.76 in (9.6 cm) on December 11, 1906. Snow is very rare in Lodi, but 1.5 in (3.8 cm) fell on January 12, 1930. January is the wettest month.