The climate of Uttar Pradesh (U.P.) is varying within Uttar Pradesh, a state of India. The dominating climate type is "humid subtropical with dry winter" (CWa) with parts of Western U.P having a semiarid climate (BS). Alternatively, some authors refer to it as "tropical monsoon climate". Some regional variations exist, however the uniformity of the vast Indo-Gangetic Plain, gives to the state a mostly single climatic pattern with minor regional variations. The temperature varies within the year. The extreme low and high temperatures are usually from 0 °C to 50 °C in several parts. During the monsoon season, floods often take place, due to heavy rain. The summers are extremely hot, the winters are cold and the rainy season can be either very wet or very dry.