Solar exposure in the north is reduced at this time due to cloud cover associated with the tropical monsoon. In contrast, during the summer months of December and January the sun is higher in the sky and there is more solar exposure. The further south you are in Australia, the lower in the sky the sun appears, and the amount of solar exposure is lower. The influence of the sun's position on solar exposure can be seen in the monthly climatologies, in particular in the map for June.
Coastal areas, especially in the south, have a higher moisture content, greater and more frequent cloud cover and therefore a lower solar exposure. This reduced cloudiness directly influences the amount of solar exposure at the surface. Areas of inland Australia have a lower moisture content in the air (see relative humidity maps) and therefore less cloud cover. The annual solar exposure map shows an area of higher solar exposure across central and northern Australia, with lower solar exposure in coastal areas in the south. The height of the sun at solar noon varies during the year. However the position of the sun in the sky is predictable and changes over the course of a day, reaching its highest point at "solar noon". Cloud cover can be quite variable and is determined by the local weather conditions and seasonal patterns. The amount of solar energy reaching the ground depends on a number of factors two of the most important are the position of the sun in the sky and the extent of cloud cover. The daily global solar exposure is the total solar energy for a day, and is typically between 1 and 35 MJ/m 2 ( megajoules per square metre).
Global solar exposure is the total amount of solar energy falling on a horizontal surface. These maps show the average daily global solar exposure over Australia (each month,season and annually) for the period 1990 to 2019. Product code: IDCJCM0019 What do the maps show?
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