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Main Characteristics of Retreating Monsoon (i) October and November are the months of retreating monsoon. (ii) During this season low monsoon trough becomes weak and is replaced by high pressure. Thus, monsoon begins to retreat. By the beginning of October it retreats completely from Northern Plains. (iii) This period is the period of transition from hot rainy season to cold winter season. It is marked by clear sky, moist ground and high temperatures giving birth to October Heat. (iv) Low pressure trough shifts to Bay of Bengal. They give rise to cyclonic depressions which cause havoc on the eastern coasts-especially the coasts of Orissa, Andhra Pradesh and Tamil Nadu with very strong storms and rains. (v) these tropical cyclons hit Sundarbans and Bangladesh too
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During October-November with the apparent movement of the sun towards the south,the monsoon trough or the low pressure trough over the northern plains become weaker.This is gradually replaced by a high-pressure system.The south west monsoon winds weaken and starts withdrawing gradually.By the begining of October,the monsoon withdraws from the northern plains.The retreat of the monsoon is marked by the clear skies and rise in temperature.While day temperatures are high,nights are cool and pleasant.The land is still moist.Owing to the conditions of high temperature and humidity ,the weather becomes rather oppresive  during the day.This is commonlyknown as October heat.In the second half of October,the mercury begins to fall rapidly in northern India.The low pressure conditions aver north western India get transferred to the Bay of Bengal by early November.This also forms cyclones.This originates in the Andaman Sea.The bulk of rainfall of the coromandel coast is derived from depressions and cyclones. 
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