Sentence:  Northern Australia is tropical and subject to a prolonged wet season (often called simply 'the <WSD>Wet</WSD>') that may last from December to April .... The <WSD>Wet</WSD> features high humidity, heavy rain, flooding that can cut off towns and roads for days on end, and, in most years, violent cyclones that cause high seas, widespread damage and sometimes loss of life. 
Meaning of the word marked with <WSD> tags:  Rainy season. (often capitalized)