Flight operations though were normal in the morning, airport officials said.
According to MeT officials, relative humidity was recorded at 97% at 8:30 a.m.
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He predicted that maximum temperature is likely to hover around 21 degrees Celsius, while skies are expected to remain partly cloudy later in the day.
Shallow-to-moderate fog cover in the national capital led to cancellation of 45 trains and delayed 12 Delhi-bound trains including Gomti, Kanpur Shatabdi and Poorva Express.
"The trains were running two to six hours late," a railway official said.
Yesterday, maximum and minimum temperatures were recorded at 21.2 degrees Celsius and 6.8 degrees Celsius respectively.
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