State-wide spatio-temporal monotonic trend (magnitude of the trend varies between −1.73 mm/year and 1.38 mm/year) for long term monsoon precipitation.

Regional cluster analysis shows increasing precipitation in Himalayan foothills and coastal regions during the monsoon season.

The PCI values are noticeably larger in places where both monsoon total precipitation and span of precipitation is less.

The PCP values reveal that the monsoon arrives earlier in North Bengal than South Bengal, while PCD values indicate that the precipitation in North Bengal is more dispersed within a year than that in South Bengal.

Fulcrum analysis suggests significant shift in concentration of monsoon precipitation could be found from Mid July to late July.

Precipitation trend observed in West Bengal is compared with that in CI region and which reveals that precipitation departure trend in Gangetic West Bengal Closely follows all India pattern and may be predicted by forecasting ensemble.