Monthly Weather Summary
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January 2564
In January 2021, high pressure area from China occasionally extended its ridge to cover upper Thailand and the northeast monsoon prevailed over the Gulf of Thailand and the southern part throughout the month especially during the beginning and the middle of the month that active high pressure areas continuously covered upper Thailand and the northeast monsoon was strengthened. These caused cool and cold weather in Thailand in particularly the northern and northeastern parts that experienced successive cold weather periodically with very cold weather in some places. There was generally cool weather with cold weather in many areas for the rest parts. However, during the end of the month, the high pressure area which covered Thailand and the northeast monsoon which prevailed over the Gulf of Thailand and the southern part was weakened. These caused increasing in temperature in majority areas but the weather in the northern and northeastern parts remained cool and cold weather in several areas. Cold to very cold weather was observed in mountainous areas and mountain tops. The mean temperature in January 2021 were below normal in almost regions especially in the northeastern part where lower than normal temperature by more than 1.5 oC, resulting in the average monthly temperature over Thailand in this month was 0.5 oC lower than normal. For rainfall, there was scanty rainfall in upper Thailand except for isolated slightly rainfall in the lower coastal areas of the eastern part on January 5, 24 and 25. Besides, due to the westerly trough moved through the upper northern region during January 29-30 resulted in unusual rainfall in the northern part. For southern part, abundant rainfall was observed during early month mainly along the east coast due to the active northeast monsoon that prevailed over the Gulf of Thailand and the southern part and the low pressure cell covered the Coastal of Malaysia during January 5-6. However, the average total rainfall over Thailand in this month was 13% lower than normal. The monthly rainfall was below normal in almost parts i.e. northern part 1.6 mm (35%), northeastern part 4.8 mm (100%), central 6.7 mm (100%), eastern part 15.5 mm (96%), and southern part (west coast) 3.9 mm (15%) while there was higher than normal in the southern part (east coast) 16.5 mm (28%).
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Issued Date February 23, 2021