Climate of Bihar in the south China sea. The maximum frequency of the tropical cyclones in Bihar is during September–November especially during the asterism called hathiya. These cyclones are essential for the maturing of paddy, and are required for the moistening of the soil for the cultivation of rabi crops. Bihar is India's most flood-prone State, with 76% of the population in the north Bihar living under the recurring threat of flood devastation. According to some historical data, 16.5% of the total flood affected area in India is located in Bihar while 22.1% of the flood affected population in India lives in Bihar.
Bihar Sharif After the Delhi Sultanate, the first Sur emperor, Sher Shah Suri (r. 1540–1545 CE), moved the regional capital to Patliputra (modern-day Patna), and the whole Magadha region came to be called Bihar. In 1867, the city was officially declared a municipality. Bihar Sharif is located from Patna, the capital of Bihar state (via 30 and 20). It is situated at the foot of Badi Pahari ( Hiranya Parbat) and on the bank of the Panchanan River. The land around Bihar Sharif is very fertile, with alluvial soil deposited by several rivers. These local rivers include the Mahane, the Panchanan –