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Winter

Winter season TCC trends are decreasing at 118 stations out of which trends are significant for 45 stations. Twenty-four stations show significantly increasing trends (Table 1). Spatial distribution of winter TCC trends is similar to the annual patterns, wherein large parts of the country show decline in cloud cover as is shown in Fig. 6b. The trend values range between -3.3 % per decade and +8.5 % per decade. Stations showing significant decrease are more coherent over Central India, south-east peninsula and along the Indian coastline, where trends are in the range of -2 % per decade to -4 % per decade. Stations in hilly regions of the Western Himalayas are also having significant decreasing trends for the winter season. Winter TCC trends are increasing over Indo-Gangetic plains and north-east India, where stations with significant increase in the range of +6 % per decade to +9 % per decade are located.

Summer

Summer total cloud cover is decreasing at 112 stations out of which trends are significant for 54 stations, while 32 stations are having significant increasing trends (Table 1). Spatial distribution of trends suggests decrease over the Western Himalayas, Central India, south peninsula and along the western coast of India as shown in Fig. 6c. The magnitude of trend values ranges between -5.3 % per decade and +7.5 % per decade. Similar to annual and winter season, stations showing significant decrease are more coherent over Central India and south peninsula, where large number of stations is having trends in the range of -4 % per decade to -6 % per decade. Summer season TCC trends are increasing over the Indo-Gangetic plains and north-east India, where many stations having significant increasing trends in the range of +6 % per decade to +8 % per decade are concentrated.

 
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