Daylight hours are shorter in winter than summer, but cloudiness is about the same. The average number of hours of bright sunshine each day in January is about 8, but in June it is less than 4. Cloud cover averages about 70% of the sky throughout the year.
Mean daily bright sunshine
(a) These means and extremes are based on all available data. The period of record for sunshine began in 1931, but is no longer being recorded.
Source: Bureau of Meteorology.