Goa, Oct. 31 -- Delhi experienced an unusually cold spell on Friday as persistent rainfall over two days brought temperatures plunging across the national capital. The city recorded its lowest October maximum temperature in 75 years, with the mercury dropping to 20.7 degrees Celsius.

The capital also witnessed its wettest October day in four years and recorded its cleanest October air quality during the same period, offering some relief from pollution.

Dark clouds covered the city throughout the day, while intermittent showers kept temperatures unusually low. Shallow fog during the early morning and late evening hours added to the winter-like conditions, prompting residents to bring out warm clothing, including jackets and shawls.

Acco...