Angara CD blocks on the west. Silli CD block has an area of 289.54 km2.Silli police station serves Silli CD block. The headquarters of Silli CD block is located at Silli village. Although Silli has a humid subtropical climate, its location and the forests surrounding it combine to produce the unusually pleasant climate for which it's known. Summer temperatures range from 20 °C to 42 degrees, winter temperatures from 8 °C to 25 degrees. December and January are the coolest months, with temperatures dipping to the freezing point in some areas. Demographics Population According to the 2011 Census of India, Silli CD block had a total population of 113,798, of which 101,054 were rural and 12,744 were urban. There were 58,087 (51%) males and 55,711 (49%) females. Population in the age range 0–6 years was 15,320. Scheduled Castes numbered 6,555 (5.76%) and Scheduled Tribes numbered 28,292 (24.86%). The percentage of Scheduled Tribes in Ranchi district, in 2011, was 47.67% of the population (rural) in the blocks. The percentage of Scheduled Tribes, numbering 1,042,016, in the total population of Ranchi district numbering 2,914,253 in 2011, was 35.76%. The Oraons forming 18.20% of the population and the Mundas forming 10.30% of the population, were the main tribes. Other tribes included (percentage of population in brackets) Lohra (2.46), Bedia (1.32) and Mahli (1.09). The only census town in Silli CD block is (2011 population figure in brackets): Muri (12,744). Large villages (with 4,000+ population) in Silli CD block are (2011 census figures in brackets): Lota (4,760), Silli (5,222) and Bantahajam (8,677). Literacy census, the total number of literate persons in Silli CD block was 72,611 (73.73% of the population over 6 years) out of which males numbered 43,018 (85.57% of the male population over 6 years) and females numbered 29,593 (61.39% of the female population over 6 years). The gender disparity (the difference between female and male literacy rates) was 24.18%. census, literacy in Ranchi district was 77.13%. Literacy in Jharkhand was 67.63% in 2011. Literacy in India in 2011 was 74.04%. See also – List of Jharkhand districts ranked by literacy rate Language and religion Hindi is the official language in Jharkhand and Urdu has been declared as an additional official language. Rural poverty 60-70% of the population of Ranchi district were in the BPL category in 2004–2005. In 2011-12, the proportion of BPL population in Ranchi district came down to 27.82%.