Cooch Behar district. Later, blowing westwards, the winds cause average rainfall of 125 cm in the northern plains and western plateau region. Autumn Period Autumn lasts for two months, October and November. Temperature In autumn, the southwest monsoon wind returns and clears the sky. So, the state gets enough sunshine to be warm in the day and releases a lot of heat to be cool at night. At this time, a maximum temperature of 30–33 °C is felt over the plains and 17–19 °C in mountains. The minimum temperature is normally around 19–22 °C in plains and 6–11 °C in mountains. Sometimes, cold waves blow over the state in autumn. Rainfall In autumn, the southwest monsoon wind returns, and the northeast monsoon wind enters West Bengal. Due to their collision in Bay of Bengal, some cyclones are created. The cyclones cause some rainfall in the state. Winter Period The winter season usually starts in December and ends in February. Temperature In winter, a mild temperature is observed over the plains. The maximum temperature goes to 23–26 °C and the minimum temperature is 9–15 °C in plains of the state. The maximum and minimum temperature in the mountains range from 0–12 °C. Higher regions of the Darjeeling Himalayas get heavy snowfall during winter. The temperatures of the western highlands at night can drop 7–9 °C, 4–7 °C in Siliguri, Jalpaiguri, Coochbehar plains and 10–11 °C in Kolkata when cold waves blow. Darjeeling's temperature can drop below freezing point. Rainfall Winter is generally dry. Most days are sunny. Occasionally, slight rainfall occurs because of conditions in northwest India. These are known as western disturbances. Extremes '''Sources: India Meteorological Department Highest Temperature The chart below shows the highest recorded temperatures for all months in West Bengal, with place and date. Lowest Temperature The chart below shows the lowest recorded temperatures for all months in West Bengal, with place and date. Temperature The Tropic of Cancer passes 6 km north of Nabadwip, so, according to latitude, the northern part of the state falls in the temperate belt and the southern part falls in the tropical belt. The southern part receives adequate rainfall and is not severely hot due to its proximity to water. Barring the mountainous parts of Darjeeling and Jalpaiguri, the entire state experiences a warm tropical monsoon climate. Regional differences are visible in the climate. In the western plateau region, rainfall is