New Delhi features a dry-winter humid subtropical climate (Köppen climate classification *Cwa*), bordering on a hot semi-arid climate. The city experiences extreme temperature variations throughout the year.
* **Summer (April to June):** Extremely hot, with daytime temperatures often exceeding 40°C (104°F) and peaking around 45°C (113°F). Heatwaves (Loo) are common. * **Monsoon (July to September):** Brings relief from the intense heat, alongside high humidity. The city receives the bulk of its ~700mm annual rainfall during this period. * **Winter (December to February):** Chilly and crisp, with temperatures frequently dropping to 4°C to 7°C (39°F to 45°F) at night.
**Air Quality:** The city faces severe smog and air pollution challenges, particularly from October to December, exacerbated by low wind speeds, crop burning in neighboring states, and vehicle emissions. The best time to visit is during the brief, pleasant transition periods of February to March, and October to November.
