Varanasi is situated between the Ganges confluences with two rivers: the Varuna and the Assi stream. The distance between the two confluences is around , and serves as a sacred journeying route for Hindus, which culminates with a visit to a Sakshi Vinayak Temple. Varanasi experiences a humid subtropical climate (Köppen climate classification "Cwa") with large variations between summer and winter temperatures. The dry summer starts in April and lasts until June, followed by the monsoon season from July to October. The temperature ranges between in the summers. Winters in Varanasi see very large diurnal variations, with warm days and downright cold nights. Cold waves from the Himalayan region cause temperatures to dip across the city in the winter from December to February and temperatures below are not uncommon. The average annual rainfall is . Fog is common in the winters, while hot dry winds, called loo, blow in the summers. In recent years, the water level of the Ganges has decreased significantly; upstream dams, unregulated water extraction, and dwindling glacial sources due to global warming may be to blame. Varanasi division which consists of four districts, and is headed by the Divisional Commissioner of Varanasi, who is an IAS officer of high seniority, the Commissioner is the head of local government institutions (including Municipal Corporations) in the division, is in charge of infrastructure development in his division, and is also responsible for maintaining law and order in the division. The District Magistrate of Varanasi reports to the Divisional Commissioner. The current Commissioner is Deepak Agarwal. Varanasi district administration is headed by the District Magistrate of Varanasi, who is an IAS officer. The DM is in charge of property records and revenue collection for the central government and oversees the elections held in the city. The DM is also responsible for maintaining law and order in the city, hence the SSP of Varanasi also reports to the DM of Varanasi. The DM is assisted by a Chief Development Officer (CDO), four Additional District Magistrates (ADM) (Finance/Revenue, City, Protocol, Executive), one Chief Revenue Officer (CRO), one City Magistrate (CM), and four Additional City Magistrates (ACM). The district has three tehsils, each headed by a Sub-Divisional Magistrate. The current DM is Kaushal Raj Sharma. Varanasi district comes under the Varanasi Police Zone and Varanasi Police Range, Varanasi Zone is headed by an Additional Director General ranked IPS officer, and the Varanasi Range is headed Inspector General ranked IPS officer.