Yamuna is the main river which passes through the territory. Apart from the flood channels of Yamuna, there are 3 canals i.e., portion of Agra Canal, Hindou Canal and western Yamuna Canal.

Delhi has an extreme climate which is very cold in winter and terribly hot in summer. The cold season begins in November and is at its peak around the time of the New Year and the Ist half of the January. After the middle of March, the weather begin to turn warm and soon it becomes hot so that from April to June one experiences extreme heat when the temperature climbs to 45 degree Celcius at times. The monsoon arrives towards the end of June. Delhi has a rainy season in winter also. It is important for the farmers of the village of the union territory because the rabi crops benefits by it. Weather is generally dry except for 2-3 months of humidity.
The climate of Delhi is a monsoon-influenced humid subtropical climate with high variation between summer and winter temperatures and precipitation. Summers start in early April and peak in May, with average temperatures near 32oC (90oF), although occasional heat waves can result in highs close to 45oC (114oF) on some days. The monsoon starts in late June and lasts until mid-September, with about 797.3 mm (31.5 inches) of rain. The average temperatures are around 29oC (85oF), although they can vary from around 25oC (78oF) on rainy days to 32oC (90oF) during dry spells. The monsoons recede in late September, and the post-monsoon season continues till late October, with average temperatures sliding from 29oC (85F) to 21oC (71oC). Winter starts in November and peaks in January, with average temperatures around 12-13oC (54-55oF). Although winters are generally mild, Delhi's proximity to the Himalayas results in cold waves that regularly dip temperatures below freezing. Delhi is notorious for its heavy fog during the winter season. In December, reduced visibility leads to disruption of road, air and rail traffic. They end in early February, and are followed by a short spring till the onset of the summer. Extreme temperatures have ranged from -0.6 °C (30.9 °F) to 47 °C (116.6 °F). Delhi can be visited without much discomfort during the months of October and November, February and March. The summer months should be avoided due to the extreme heat, the monsoons due to the risk of disease and high humidity, while the months of December and January should be avoided due to the dense fog and often freezing temperatures.