December Weather in Sydney

By: setearning

Daily high temperatures increase by 2°F, from 77°F to 79°F, rarely falling below 67°F or exceeding 90°F. Daily low temperatures increase by 3°F, from 63°F to 67°F, rarely falling below 58°F or exceeding 71°F. For reference, on January 25, the hottest day of the year, temperatures in Sydney typically range from 68°F to 80°F, while on July 19, the coldest day of the year, they range from 47°F to 62°F.

The month of December in Sydney experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 37% to 29%. The lowest chance of overcast or mostly cloudy conditions is 29% on December 30


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sydney, the chance of a wet day over the course of December is decreasing, starting the month at 28% and ending it at 22%


The average sliding 31-day rainfall during December in Sydney is gradually decreasing, starting the month at 2.8 inches, when it rarely exceeds 5.4 inches or falls below 0.7 inches, and ending the month at 2.5 inches, when it rarely exceeds 4.6 inches or falls below 0.7 inches. . 

Rain Fall 

Over the course of December in Sydney, the length of the day is essentially constant. The shortest day of the month is December 1, with 14 hours, 14 minutes of daylight and the longest day is December 21, with 14 hours, 25 minutes of daylight. 


The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.  


We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid 


This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. 


The average daily incident shortwave solar energy in Sydney is essentially constant during December, remaining within 0.2 kWh of 7.5 kWh throughout. The highest average daily incident shortwave solar energy during December is 7.8 kWh on December 31.

Solar Energy 

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