Sydney has a humid subtropical climate with warm summers and mild winters. At Sydney Observatory Hill, the 1991-2020 reference averages range from a daily high of 65°F (18°C) in Jun to 82°F (28°C) in Feb. Monthly precipitation averages sum to 45.2 inches (1148 mm) per year.
Sydney's summer runs December through February and can bring heat and severe thunderstorms. Autumn and winter have the greatest frequency of east coast lows, which can produce heavy rain, damaging winds, and dangerous surf. These lows can also occur in other seasons. Spring brings warming temperatures and variable conditions.