Dense to very dense fog was witnessed in isolated pockets over Punjab, Haryana and west Uttar Pradesh and dense fog in isolated pockets over northwest Rajasthan, northwest Madhya Pradesh and Bihar during 5.30 p.m. on Friday and 5.30 a.m. on Saturday.

Minimum temperature in the city improved five notches recording 7 degrees Celsius, while Hisar was coldest in Haryana at 2. Delhiites woke up to an overcast sky and light rain at isolated places of south and south-west districts. Similarly in Haryana's Rewari, Bhiwadi, Manesar, Gurugram, Farukhnagar, Sonipat, Gannaur, Hansi, Tosham, Jind, Safidon, Panipat, Karnal, Kaithal, Narwana and Narnaul; Rajasthan's Deeg, Bharatpur; and Uttar Pradesh's Mathura, Hathras, Shamli sky was overcast as rain and thunderstorms were witnessed.

As per India Meteorological Department (IMD) forecast, "the impact of "Western Disturbance has begun over Northwest India including Delhi".

" Palam reported 0.4 mm rainfall, Ridge, Ayanagar and Lodi Road reported trace rainfall. "The Western Disturbance is likely to keep causing similar kind of weather over the plains of Northwest India till January 5 (Tuesday) with maximum intensity on January 4," the IMD said.