Delhi is located at 28.38° N and 77.13° E and lies in the northern part of India. It is bordered by the Indian state of Uttar Pradesh on the east and Haryana on the west. Delhi can be divided into three major geographical regions: the Yamuna flood plain, the ridge and the Plains. The low-lying Yamuna flood plains provide fertile alluvial soil suitable for agriculture. However, these plains are prone to recurrent floods. With an average altitude of 293 meters above sea level, the ridge forms the most dominating feature in this region. It originates from the Aravalli Hills in the south and encircles the west, north-east and north-west portions of the city. The Great Plains of Northern India are located in the south of the city and cover most part of Delhi.

Yamuna, one of India's most sacred rivers in India, is the only main river which flows through Delhi. The major part of the city, including New Delhi, lies on the western side of the river. The part of the city lying on the eastern side of the river is known as the Old City which includes the urban area of Shahdara.

Delhi has a semi-arid climate with high variation between summer and winter temperatures. The summers are long, starting in early April and lasting till October with the rainy season in between. Extreme temperatures have ranged from a minimum of -2 to a maximum of 47 °C [1]. Winters start in November and is at its peak in January.

The average annual rainfall is approximately 670 mm or 27 inches, most of which falls in the months of July and August during the Monsoons. Traditionally, the Monsoons are supposed to touch Delhi by June 29 every year.