Delhi recorded a maximum temperature of 25.4 degrees Celsius on Thursday, its lowest for an October day in four years, as Cyclone Arnab's aftermath brought cooler weather, rain and thunderstorms across several northern and eastern states. Delhi recorded its coldest October day in four years on Thursday as the maximum temperature at the Safdarjung weather station plunged to 25.4 degrees Celsius, 5.6 degrees below normal, following the weakening of Cyclone Arnab.