Daily Max. Temp.
Monthly Weather Summary
In May 2013, hot weather still persisted mainly in upper Thailand with very hot weather in some areas. However, during the first half of the month, the influence of high pressure areas extending to cover upper Thailand in addition with the passage of the westerly trough through the upper northern and the prevailing of the southeasterly wind over upper Thailand resulted in intermittent rainfall with thundershower in several areas. After that, the southwest monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand associated with the low pressure cell covering the Gulf of Tonkin for few days caused increasing in the area of consecutive rainy day leading to rainy season on May 18. However, the light to moderate rainfall were mainly observed in this month inducing below normal rainfall in most parts i.e. northern part 64.5 mm (36%), central part 78.9 mm (46%), eastern part 123.1 mm (55%) and southern part (east coast) 34.1 mm (24%) while it was inversely above normal in the northeastern and the southern part (west coast) 16.3 mm (9%) and 9.2 mm (3%), respectively. The average rainfall over the whole areas of Thailand was 23 % lower than normal.
Issued at June 14, 2013
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