Several trains of North-Western Railways were running late by several hours due to the ongoing fog in Uttar Pradesh, Haryana, Punjab and Delhi, a railways spokesman said.
Aviation regulator DGCA has also directed all schedule domestic airlines to operate only with CAT-III complaint aircraft along with trained crew during fog hours.
It was a chilly day in the national capital today with the minimum temperature settling at 8 degrees Celsius, a notch below the season's average.
Visibility was recorded at 1,500 meters at 5.30 AM which improved to 2,000 meters at 8.30 AM, he said.
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Cold wave intensified in Kashmir Valley with Leh town in Ladakh region being the coldest place in Jammu and Kashmir as the mercury fell there to minus 14 degrees.
He said the nearby Kargil town recorded a low of minus 11.4 degrees.
Srinagar recorded a low of minus 0.3 degrees.
Cold weather conditions prevailed today in Haryana and Punjab with temperatures hovering below normal levels at most places.
The minimum temperature at Chandigarh settled at 7.4 deg C. However, the residents of the Union Territory woke up to a sunny morning today.
Severe cold wave sweeping across Rajasthan claimed the life of a middle-aged beggar in Jaipur's Ramganj area.
He was found unconscious by passersby in the early morning in the open.
Jaipur experienced the coldest night of the season with 5.3 degrees, about 6 degree less than normal. While Churu recorded the lowest temperature of 2.4 degree C.
The Meteorological Department has predicted mainly dry
It said Kashmir may witness a dry January like the last year with less chances of snowfall during the remaining days of the month.
Owing to the dry weather, the minimum temperature in the Valley has mostly hovered below the freezing point and resulted in increase in common ailments.
Moderate to shallow fog enveloped parts of Punjab and Haryana too, adversely affecting rail and road traffic in the region, even as the minimum temperatures hovered above normal.
Visibility was reduced in the morning due to fog and the MeT department has forecast similar conditions during the next 48 hours.
However, the minimum temperatures hovered between two to five degrees celsius above normal for this time of the season, the MeT office said.
While Amritsar had a low of 6.6 degrees Celsius, three notches above normal, the minimum at Chandigarh was 6.9 degrees Celsius, two notches above normal.
Among other places in the region, Narnaul settled at a low of 9.5 degrees Celsius, followed by 10.7 degrees Celsius at Ludhiana, 11 degrees Celsius each at Ambala and Patiala, 11.6 degrees Celsius at Karnal, and 12 degrees Celsius at Hisar.
Fog engulfed north-eastern parts of the state including Alwar, Bharatpur, Srigangangar, Bikaner, Hanumangarh reducing visibility level on roads, he said.
As many as nine trains were running late from 35 min to 2 hr 50 min, North Western Railway's CPRO Tarun Jain said.
Mount Abu on hills recorded minimum of 6.4 degree C followed by Churu 6.8, Sikar 7, Bikaner 7.3, and Jaipur 8 degree celsius.
No major change in the weather is predicted in the next 24 hours in the state, the forecast said.