Cambodia

CambodiaCambodia’s climate, like that of much the rest of mainland Southeast Asia is dominated by monsoons, which are known as tropical wet and dry because of the distinctly marked seasonal differences. The monsoonal air-flows are caused by annual alternating high pressure and low pressure over the Central Asian landmass. In summer, moisture-laden air—the southwest monsoon—is drawn landward from the Indian Ocean. The flow is reversed during the winter, and the northeast monsoon sends back dry air. The southwest monsoon brings the rainy season from mid-May to mid-September or to early October, and the northeast monsoon flow of drier and cooler air lasts from early November to March. Temperatures are fairly uniform throughout the Tonlé Sap Basin area, with only small variations from the average annual mean of around 25 °C (77.0 °F).

The maximum mean is about 30 °C ; the minimum mean, about 24 °C. Maximum temperatures of higher than 32 °C, however, are common and, just before the start of the rainy season, they may rise to more than 38 °C. Minimum night temperatures sporadically fall below 20 °C. in January, the coldest month. May is the warmest month – although strongly influenced by the beginning of the wet season, as the area constitutes the easternmost fringe of the south-west monsoon. Tropical cyclones only rarely cause damage in Cambodia.

The total annual rainfall average is between 1,000 and 1,500 millimeters (39.4 and 59.1 in), and the heaviest amounts fall in the southeast. Rainfall from April to September in the Tonlé Sap Basin-Mekong Lowlands area averages 1,300 to 1,500 millimeters (51.2 to 59.1 in) annually, but the amount varies considerably from year to year. Rainfall around the basin increases with elevation. It is heaviest in the mountains along the coast in the southwest, which receive from 2,500 millimeters (98.4 in) to more than 5,000 millimeters (196.9 in) of precipitation annually as the southwest monsoon reaches the coast. This area of greatest rainfall, however, drains mostly to the sea; only a small quantity goes into the rivers flowing into the basin. Relative humidity is high throughout the entire year; usually exceeding 90 percent. During the dry season daytime humidity rates average around 50 percent or slightly lower, climbing to about 90 percent during the rainy season. (Source: Wikipedia)

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