Bounded by the Atlantic Ocean and the Delaware River, most of New Jersey has a moderate climate with cold winters and warm, humid summers. Winter temperatures are slightly colder and summer temperatures slightly milder in the northwestern hills than in the rest of the state.
In Atlantic City, the average mean temperature is 53°F (12°C), ranging from 31°F (–1°C) in January to 75°F (24°C) in July. Precipitation is plentiful, averaging 46 in (117 cm) annually; snowfall totals about 16 in (41 cm). At Atlantic City, annual precipitation (1971–2000) was 40.6 cm (103 cm). The annual average humidity is 81% at 7 AM, reaching a normal high of 87% in September.
Statewide, the record high temperature is 110°F (43°C), set in Runyon on 10 July 1936; the record low is –34°F (–37°C), set in River Vale on 5 January 1904. A 29.7-in. (75.4-cm) accumulation on Long Beach Island in 1947 was the greatest 24-hour snowfall in the state's recorded history. Occasional hurricanes and violent spring storms have damaged beachfront property over the years, and floods along northern New Jersey rivers especially in the Passaic River basin, are not uncommon. A serious drought occurs, on average, about once every 15 years.