Why is northwest Australia not a monsoon climate?

Because there is no ocean warm current rushing to the north of Australia, the rainfall is insufficient, and the northwest of Australia has a savanna climate.

Australia is far away from other continents and separated by vast oceans, so it is difficult to form large-scale climate characteristics.

The most important feature of monsoon is that precipitation changes obviously with the rotation of monsoon in a year. East Asia, South Asia and Southeast Asia are two typical monsoon climate regions, but due to the differences in latitude and geographical location, monsoon climate also has its own characteristics. Macao belongs to the Asian monsoon, which dominates between the mainland and the ocean in winter and summer. The air pressure is different, the wind direction is opposite, the characteristics of the wind are different, and the weather is very different. From April to August every year, it is controlled by the ocean airflow, and the southeast and southwest winds prevail, which is the summer monsoon; 9. From 10 to February and March of the following year, under the control of continental airflow, north, northwest and northeast winds prevail, which is winter wind.

Extended data The western plateau of Australian continent is located in the lower part of Oceania continent, and in the west of South Australia horst and rift valley. Including the western plateau and the narrow plain along the southern coast, it occupies the western half of the whole continent and covers an area of about 5 million square kilometers. Covering 60% of the total area of the mainland, the western plateau is the oldest part of Australia, which is roughly consistent with the scope of the ancient platform.

It was originally a part of Gondwana old land, and the basement of the old land was composed of Precambrian granite, diorite and diabase, and its age was mostly 20-30× 108a. After the formation of the mainland, in the long geological period, the ancient mountain system was eroded and leveled, leaving some isolated mountains on the surface. At the end of Tertiary, the western plateau was lifted and cut again, and volcanic activity occurred in some areas, forming basalt quilts. From the second half of Pleistocene, the climate began to dry, and the western plateau formed a vast desert under dry climate conditions.