Explanation: Kolkata, the capital city of West Bengal, experiences a tropical wet and dry climate, which is influenced by the monsoon winds. The monsoon season in Kolkata is a crucial period characterized by heavy rainfall, which typically begins in June and continues until September. This period is known as the southwest monsoon season, during which the city receives the majority of its annual rainfall.
The monsoon season in Kolkata is a result of the southwest monsoon winds that blow from the Indian Ocean towards the Indian subcontinent. These winds bring moisture-laden air, which condenses and results in heavy rainfall. The monsoon season is essential for agriculture in the region, as it provides the necessary water for crops. However, it can also lead to flooding and other weather-related issues.
It is important to note that the monsoon season does not start in January, which is part of the winter season in Kolkata. The winter season is generally dry and cool, with temperatures ranging from 10°C to 25°C. Similarly, December is also part of the winter season and not the start of the monsoon season.
Understanding the seasonal weather patterns in Kolkata is crucial for various activities, including agriculture, urban planning, and disaster management. The monsoon season, starting in June and ending in September, is a significant period that affects the daily life and economy of the city.
In conclusion, the correct answer is June, as it marks the beginning of the monsoon season in Kolkata, which is characterized by heavy rainfall until September. This understanding of the monsoon season is essential for anyone studying the geography and climate of West Bengal.