The IMD has issued cold day and dense fog warning for several states and UTs for Day 1 of 2025. Cold day conditions are very likely in Punjab, Haryana, Chandigarh, Delhi and Uttar Pradesh. Meanwhile, dense fog is very likely in Himachal Pradesh, Assam, Meghalaya, Nagaland, Manipur, Mizoram and Tripura in night and morning hours.