It was a cold, foggy Saturday morning here, delaying over 30 trains. The Met Office has forecast clear day ahead.Garib Rath from Bhagalpur to Delhi was running late by 22 hours while Mahananda Express from Alipore Duar to Delhi was running behind schedule by 18 hours. Seemanchal Express too was running late by 18 hours, authorities said.The day's minimum temperature settled a level below the season's average at 7.4 degrees Celsius."There was dense fog in the morning and sky was partly cloudy. However, during the day the sky will be clear. The maximum temperature is likely to hover around 17 degrees Celsius," said an official of the India Meteorological Department.Humidity at 8.30 a.m. was 89 percent.Friday was similar with the maximum temperature settling six notches below the season's average at 16.4 degrees Celsius, while the minimum was 7.4 degrees Celsius, a notch below average.