Out of 195 stations, 141 stations are showing decreasing trend in the monsoon season cloud cover. Numbers of stations having significantly decreasing trends are 82, while 18 stations are showing significantly increasing trends (Table 1). Spatial patterns of trends indicate a general decline in cloud cover over the country except over north-west India, where there are increasing trends (Fig. 6d). The magnitude of the monsoon season TCC trend values ranges between -9.3 % per decade and +5.8 % per decade. Stations showing significant decrease in monsoon TCC are more coherent over west, east, Central and Peninsular India, where large numbers of stations are having higher magnitude (-6 % per decade to -10 % per decade) of decreasing trend. In contrast, many stations in the north-west India and hilly regions of the Western Himalayas are having significant increasing trends in the range of +4 % per decade to +6 % per decade in monsoon season.
Postmonsoon season cloud cover is decreasing at 112 stations out of which trends are significant at 37 stations, while trends are increasing significantly at 11 stations as given in Table 1. Spatial distribution of trends suggests a decrease over Central India and along the western coast as shown in Fig. 6e. The magnitude of trend values of postmonsoon season TCC is between -5.5 % per decade and +6.8 % per decade. Stations showing significant decrease are more coherent over Central India and along the west coast, where trends are in the range of -4 % per decade to -6 % per decade. Stations showing significant increasing trends in postmonsoon TCC are over north-eastern states and coastal Tamil Nadu, where rising trends are in the range of +4 % per decade to +7 % per decade.