Winter has finally set in, at least six weeks later than normal. Scientists say when winters set in late, they usually linger for longer. They also say that February this year is likely to be colder than it usually is. The drop in temperature has been significant in the past week. Minimum temperatures across the country have started getting aligned to their normal values. For all of December and the first two weeks of January, temperatures in most parts of India were substantially higher than normal. <br/><br/>In some places, the departures were as much as 5-8 degrees more than normal. Besides, the small amount of rainfall that takes place in late December and early January, which brings the chill in the air, was about 85 per cent below normal. AIR correespondent reports that Scientist were attributing long and strong El Ni'o as one of the reasons for the warmer winter in India.