Explanation: Calcutta, or Kolkata, experiences a tropical wet and dry climate, which is characterized by distinct wet and dry seasons. The climagraph for Calcutta shows the temperature and precipitation patterns throughout the year, which are crucial for determining the most pleasant month for an outdoor festival.
The monsoon season in Calcutta typically lasts from June to September, with July and August being the peak months. During this period, the city experiences high humidity and frequent rainfall, which can make outdoor activities uncomfortable. The high humidity levels and frequent showers would not be ideal for an outdoor festival, as they can lead to slippery conditions and a generally damp atmosphere.
As the monsoon season transitions into the dry season, the weather begins to improve. September marks the tail end of the monsoon, and while the rainfall decreases, the humidity remains relatively high. This can still make the weather uncomfortable for outdoor activities, as the high humidity can make the air feel heavy and sticky.
October, however, is the month that marks the end of the monsoon season and the beginning of the dry season. During this month, the temperature is moderate, and the humidity is lower, making it a comfortable time for outdoor activities. The weather is generally pleasant, with clear skies and comfortable temperatures, which are ideal for an outdoor festival. The lower humidity levels and moderate temperatures create a more enjoyable environment for outdoor events.
Therefore, based on the climagraph and the weather conditions in Calcutta, October is the most pleasant month for an outdoor festival. The moderate temperatures and lower humidity levels make it a comfortable and enjoyable time for outdoor activities, unlike the high humidity and frequent rainfall of the monsoon months.