Delhi Geography, Climate & Nature

The National Capital Territory covers about 1,483 square kilometres. Haryana surrounds it to the north, west and south; Uttar Pradesh lies beyond the Yamuna on the east. The wider National Capital Region extends beyond these legal boundaries, but Noida, Gurugram and other neighbouring cities are not part of the territory.

Ridge, plain and river

The Delhi Ridge is the northernmost extension of the Aravalli system. Its rocky outcrops run through the territory in separated northern, central and southern sections. Between them lies the broad alluvial plain on which most urban development stands.

The Yamuna and its floodplain form the eastern geographic system. Wetlands, grassland, restored forest and water bodies in the floodplain perform a different ecological role from the dry, open-canopied thorn forest of the Ridge.

What geography means for a visit

Old Delhi and the Red Fort sit near the river; Mehrauli and Tughlaqabad follow the southern Ridge; New Delhi occupies the central plain. The visitor city is therefore polycentric, not a ring around one square.

The Metro bridges many long corridors, but large compounds, divided roads and incomplete footways complicate the final approach. A route that looks short at territory scale can still contain a slow station exit or road crossing.

Delhi's climate has four practical phases. Winter is cool and mainly dry, late spring is extremely hot, the southwest monsoon brings concentrated rain, and the post-monsoon period cools gradually.

Cool season

At Safdarjung, January's normal daily range is 7.5–20.1°C and December's is 8.4–22.8°C. Fog is frequent in these months, and poor-air episodes can reduce the value of long outdoor plans.

Hot season

Normal daily maxima rise from 36.5°C in April to 39.9°C in May and 39.0°C in June. Heatwaves can exceed these normals. Early starts, shade and indoor midday breaks are practical requirements.

Monsoon and transition

Normal rainfall reaches 195.8 mm in July, 226.8 mm in August and 128.0 mm in September. Rain is uneven, so a dry morning can coexist with later waterlogging or transport delay.

October normally combines low rainfall with a 33.0°C maximum and 19.5°C minimum. It can feel easier for walking, but air quality must be checked rather than inferred from temperature.

Delhi's biodiversity is organised around two contrasting landforms: the rocky Ridge and the Yamuna floodplain. The Ridge supports open-canopied thorn forest, while the floodplain supports wetlands, grassland, water bodies and restored riverine habitat.

The Delhi Development Authority lists seven biodiversity parks: Yamuna, Aravalli, Northern Ridge, Tilpath Valley, Neela Hauz, Tughlaqabad and Kalindi. These are ecological restoration projects as well as public learning spaces.

Asola Bhatti Wildlife Sanctuary protects 27.498 square kilometres in the southern Ridge. Formerly degraded and mined areas have been restored through planting, grassland work, water conservation and restrictions on damaging use.

These landscapes are dispersed. Choose one that fits the day's corridor, check current entry conditions and stay on permitted paths. Plastic, feeding, pets, noise and vegetation damage are restricted in city forests.

Delhi's wildlife is most visible where habitat remains connected. Asola Bhatti supports nilgai, peafowl, other birds and butterflies in restored southern-Ridge vegetation. The Forest Department also handles rescues involving monkeys, sambar deer and snakes.

Wetlands support a different community. The Najafgarh lake area has recorded resident and migratory birds using the Central Asian Flyway, including several threatened raptors and cranes. Water conditions and seasonal movement affect what is present.

Watch quietly from established paths. Do not feed monkeys, nilgai or birds, and do not approach a stranded or injured animal. Feeding changes behaviour and can create danger for people and wildlife.

A city nature visit should be habitat-led, not a guaranteed species checklist. Early hours are often quieter, but current access and local guidance take precedence.