Title - Delhi records season`s coldest day at 5.2 degrees Celsius - train schedules out of gear

According to Northern Railway, the thick fog cover in north India has thrown train schedules out of gear.

"Twenty-four trains are running behind schedule and 13 have been cancelled. The train services were severely hit today (Monday) owing to the dense fog in many parts of north India," a Northern Railway statement said.

However, flights in the national capital have not been affected so much by fog this year - thanks to the CAT-III system set up on the Delhi airport runways to help aircrafts operate even in low visibility conditions.

Sunday's maximum temperature settled four notches below average at 17 degrees Celsius, while the minimum temperature was 7.7 degrees Celsius, which is average for this time of the year.