The correct answer is High temperature associated with high humidity. Explanation & Key Takeaways: • The months of October-November form a period of transition from hot rainy weather to dry winter conditions. • The withdrawal of monsoon is marked by clear skies and a rise in temperature. • While the day temperature is high, the nights are cool and pleasant. • The ground is still moist. • Due to the high temperature and humidity conditions, the weather becomes quite oppressive during the day. • This is commonly referred to as the 'October Heat'. • In the second fortnight of October, the mercury starts falling rapidly in North India.