New Delhi, Jan. 13 -- The plains of northwest India were far colder than the hills on Monday, according to minimum temperature data from the India Meteorological Department (IMD). Delhi's Safdarjung recorded 3.2 degrees C; Hissar 2.6degC; Amritsar 1.1 degC; Churu 1.3 degC; Karnal 3.5 degC; Meerut 4.5 degC. In comparison, popular tourist destinations in north India such as Mussoorie recorded 7.7degC and Shimla 8.8degC. This is mainly because of the cloud cover over the hills, which is not allowing the warmth from the day to escape. "A western disturbance is impacting the upper reaches so the night was cloudy. This is mainly why minimum temperatures are higher over the hills," said M Mohapatra, director general, IMD. Cold wave to severe cold ...