Monthly Weather Summary
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January 2561
In January 2018, high pressure area from China periodically extended its ridge to cover upper Thailand causing cool weather in the northern and northeastern parts almost the entire month with cold weather in the upper northern part and cool weather presented in many areas for the rest of the parts. Active high pressure area persisted continuously during mid-January caused temperature decreased with generally cool weather in upper Thailand and cold weather in the northern and northeastern parts and some areas of central including Bangkok and vicinity and eastern part as well. For rainfall, with the prevailing of westerly wind in upper level over upper northern part and the easterly wind blowing over most areas of upper Thailand causing intermittent rainfall in upper Thailand mainly during the beginning and the end of the month. In southern part, the influence of northeast monsoon prevailed over the Gulf of Thailand during the beginning and the middle of the month and the easterly wind prevailed over southern part during the end of the month resulted in isolated to scattered rain almost the whole month, particularly during intensified northeast monsoon bringing major rainfall events with decreasing temperature at that times.
Mean temperature in January was above normal in most parts except for slightly below normal in the west coast of southern part. Monthly total rainfall over Thailand was higher than normal in all parts i.e. northern part 6.7 mm (146%), northeastern part 0.3 mm (6%), central 37.0 mm (552%), eastern part 47.0 mm (292%), southern part (east coast) 70.9 mm (119%) and southern part (west coast) 156.6 mm (593%).
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Issued Date February 16, 2018