Talking to reporters while emerging from state Legislative Assembly, Kumar described the heavy rain in Tamil Nadu as "natural disaster" triggered by climate change.
"Where earlier there used to be less rain, it is now witnessing excessive rain ... We all are bothered about this," he said.
"Today is December 2 but still winter has not arrived in Bihar unlike in the past," he said, adding it was an indication of change in climate.
Meanwhile, Bihar Deputy Chief Minister Tejaswi Yadav announced donating his first month's salary to victims of rain in Tamil Nadu.
While talking to a section of mediapersons, Tejaswi Yadav appealed to other legislators to generously donate for relief of TN rain victims.
Chennai today turned a virtual island and several coastal areas of Tamil Nadu were marooned by flood waters after unprecedented rains in 100 years pounded the city, its suburbs and neighbouring districts destroying crucial road and rail links, shutting the airport and rendering thousands homeless.
