It was a foggy morning in the national capital on Friday with the minimum temperature recorded at 13 degrees Celsius, a notch below the season's average. Visibility stood at 400 metres."There was moderate fog in many places. The sky will remain clear ahead," said an official of the India Meteorological Department. Humidity at 8.30 a.m. was 93 per cent.Thursday's maximum temperature settled at 30.5 degrees Celsius, one notch above the season's average, while the minimum was recorded at 14 degrees Celsius, normal for the season.According to the Delhi International Airport Limited (DIAL), flights were operating normally.