The period between June to September is the monsoon season in Kolkata. Kolkata experiences heavy rains during the monsoons. Monsoon is influenced by the southeast monsoon winds. The average annual rainfall is about 1582 mm. The downpour is the maximum in the month of August.
The weather during the winter is very favorable in Kolkata. December to February is the winter season in Kolkata. The early mornings are foggy here. The temperature varies between 12°C to14°C and does not go below 10°C.
It is during this time that would be the best choice to plan for this city as the humidity is low and the weather is pleasurable. So planning for the 'city of joy' is really a joyful experience during the winter season.