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The rainfall distribution by month in Cairns, Australia. The wet season (sometimes called the rainy season or monsoon season) is the time of year when most of a region's average annual rainfall occurs. [1] Generally, the season lasts at least one month. [2] The term green season is also sometimes used as a euphemism by tourist authorities. [3]
The northern end, including Darwin, has a tropical savannah climate (Köppen Aw) [26] with high humidity and two seasons, the wet (October to April) and dry season (May to September). During the dry season nearly every day is warm and sunny, and afternoon humidity averages around 30%. There is very little rainfall between May and September.
Cairns's mean annual rainfall is just under 2,000 millimetres (79 in), although monthly totals in the wet season from December to April can exceed 1,000 mm (39 in), with the highest monthly rainfall being recorded in January 1981, when over 1,417.4 mm (55.80 in) of rain fell. [37]
Rainfall distribution by month in Cairns showing the extent of the wet season at that location. The wet, or rainy, season is the time of year, covering one or more months, when most of the average annual rainfall in a region falls. [68] The term green season is also sometimes used as a euphemism by tourist authorities. [69]
The Köppen climate classification is the most widely used climate classification system. [2] It defines a tropical climate as a region where the mean temperature of the coldest month is greater than or equal to 18 °C (64 °F) and does not fit into the criteria for B-group climates, classifying them as an A-group (tropical climate group). [3]
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In 1948, C. W. Thornthwaite proposed an AI defined as: = where the water deficiency is calculated as the sum of the monthly differences between precipitation and potential evapotranspiration for those months when the normal precipitation is less than the normal evapotranspiration; and where stands for the sum of monthly values of potential evapotranspiration for the deficient months (after ...
Brown snow fell in the Maine town of Rumford after a malfunction at a paper mill caused the release of spent black liquor.