Delhi's climate has sharp changes in tempratures. In winters its too cool to resist and in summers the is unbearable. Delhi is located at 28°61'N, 77°23'E, and lies in northern India. It borders the Indian states of Uttar Pradesh on East and Haryana on West, North and South. Delhi lies almost entirely in the Gangetic plains. Two prominent features of the geography of Delhi are the Yamuna flood plain and the Delhi ridge. The low-lying Yamuna flood plains provide fertile alluvial soil suitable for agriculture. However, these plains are prone to recurrent floods. Reaching up to a height of 318 m (1043 ft), the ridge forms the most dominating feature in this region. It originates from the Aravalli Range in the south and encircles the west, northeast and northwest parts of the city. Yamuna, a sacred river in Hinduism, is the only major river flowing through Delhi. Most of the city, including New Delhi, lies west of the river. East of the river is the urban area of Shahdara. Delhi falls under seismic zone-IV, making it vulnerable to major earthquakes.

Delhi has a semi-arid climate with high variation between summer and winter temperatures. Summers are long, from early April to October, with the monsoon season in between. Winter starts in October and peaks in January and is notorious for its heavy fog. Extreme temperatures range from -0.6 °C (30.9 °F) to 47 °C (117 °F). The annual mean temperature is 25 °C (77 °F); monthly mean temperatures range from 14 °C to 33 °C (58 °F to 92 °F). The average annual rainfall is approximately 714 mm (28.1 inches), most of which is during the monsoons in July and August. The average date of the advent of monsoon winds in Delhi is 29 June.