The city has average summer temperatures in May ranging from lows of 24 °C (75.2 °F)to highs above 52 °C (125.6 °F)and winter lows usually are around 6 °C (42.8 °F). The Asansol-Durgapur region is composed of undulating latterite soil. This area lies between two mighty rivers – the Damodar and the Ajay. They flow almost parallel to each other in the region – the average distance between the two rivers is around 30 km (19 mi). For ages the area was heavily forested and infested with plunderers and marauders.
The discovery of coal led to industrialisation of the area and most of the forests have been cleared. The coalfields directly led to the first railway from Howrah being routed to Raniganj: the East Indian Railway line was opened to traffic in early 1855.Nunia, a small stream about 40 km (25 mi) long has its origin near Adra village in the Salanpur area, flows through the Barabani area, past Asansol and joins the Damodar in the Raniganj area. Gram panchayats under Raniganj Panchayat Samiti are: Ratibati, Tirat, Egra, Amrasota, Jemari and Ballavpur.
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Source From :- Wikipedia