Ujjain: In the past two days minimum temperature has dipped from 12.5 degree centigrade to 7.5 degree centigrade accompanied by chilly winds turned the weather of city. Sudden turn in mercury has begun to show its impact with the disappearance of fog and clouds spreads in the sky for the past few days. Significant rise in wind speed of 6 kilo metre per hour were registered on Sunday along with relative humidity of 87 during morning time.