Big Kanchipuram while most of the Vishnu temples were in Little Kanchipuram. Groundwater is the major source of water supplies used for irrigationthe block of Kanchipuram has 24 canals, 2809 tanks, 1878 tube wells and 3206 ordinary wells. The area is rich in medicinal plants, and historic inscriptions mention the medicinal value. Dimeria acutipes and Cynodon barberi are plants found only in Kanchipuram and Chennai. Climate Kanchipuram has a tropical climate (Köppen Aw), which is generally healthy. Temperatures reach an average maximum of between April and July, and an average minimum of between December and February. Relative humidities of between 58% and 84% prevail throughout the year. The humidity reaches its peak during the morning and is lowest in the evening. The relative humidity is higher between November and January and is lowest throughout June. Most of the rain occurs in the form of cyclonic storms caused by depressions in the Bay of Bengal during the northeast monsoon. Kanchipuram receives rainfall from both Northeast Monsoon and Southwest Monsoon. The highest single day rainfall recorded in Kanchipuram is on 10 October 1943. The prevailing wind direction is south-westerly in the morning and south-easterly in the evening. In 2015, Kanchipuram district registered the highest rainfall of in Tamil Nadu during Northeast Monsoon season. On 13 November 2015, Kanchipuram recorded a mammoth of rain, thereby causing severe flooding. Government and politics The Kanchipuram municipality was officially constituted in 1866, covering , and its affairs were administered by a municipal committee. It was upgraded to a grade I municipality in 1947, selection grade municipality in 1983 and special grade municipality in 2008. the municipality occupies , has 51 wards and is the biggest municipality in Kanchipuram district. The population of kanchipuram in 2011 was 2,34,353. The functions of the municipality are devolved into six departments: General, Engineering, Revenue, Public Health, city Planning and the Computer Wing, all of which are under the control of a Municipal Commissioner, who is the supreme executive head. The legislative powers are vested in a body of 51 members, each representing one ward. The legislative body is headed by an elected chairperson who is assisted by a deputy chairperson. On 24 August 2021, the state government announced the upgrading of Kanchipuram town to Kanchipuram City Municipal Corporation. Kanchipuram comes under the Kanchipuram state assembly constituency. From the state delimitation after 1967, seven of the ten elections held between 1971