Explanation:

 Winter season is experienced in the state from mid-November to February, with January being the coldest month. Winter is cold to mild over the plains with average minimum temperatures of 9 to 16 °C.A cold and dry northern wind blows in the winter, substantially lowering the humidity level. However some rainfall may be received from the Western Disturbances. However, the Darjeeling Himalayan hill region experiences a harsh winter, with occasional snowfall at places.In the northern plain district like Jalpaiguri, Coochbehar, Alipurduar the minimum temperature can often drop to the 5 to 7 degree C mark. Occasionally slight rainfall occurs under the influence of low depressions in northwest India. These is known as' western disturbances'....