At least 13 trains were cancelled, 39 delayed and four rescheduled due to fog in several parts of northern India.
Humidity in Delhi at 8.30 a.m. was 92 per cent.
"The sky will be mainly clear during the day," an India Meteorological Department (IMD) official told IANS.
The maximum temperature was likely to hover around 25 degrees Celsius.
The maximum temperature on Sunday settled at 23.3 degrees Celsius, three notches above the season's average and the minimum temperature was recorded at 5.7 degrees Celsius, three notches below the average.
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