We present the measurements of cloud-base height variations over Aryabhatta Research Institute of Observational Science, Nainital (79.45E, 29.37N, 1958 m amsl) obtained from Vaisala Ceilometer, during the nearly year-long Ganges Valley Aerosol Experiment (GVAX). The cloud-base measurements are analysed in conjunction with collocated measurements of rainfall, to study the possible contributions from different cloud types to the observed monsoonal rainfall during June to September 2011.

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