For residents of New Delhi, the transition of seasons is often felt most acutely in the early hours of the morning. This past week, that transition took a notable turn. On Monday, October 27, the city recorded a minimum temperature of 15.3 degrees Celsius, marking the lowest minimum temperature recorded in the capital during October in three years.
This drop in temperature is not merely a random occurrence but a reflection of the earth's natural cooling cycles. As the nights grow longer, the surface of the earth loses the heat it absorbed during the day more rapidly. This process, known as radiative cooling, is particularly effective under clear skies, allowing the ground—and consequently the air directly above it—to shed warmth. This phenomenon has been the primary driver behind the recent dip, creating a crisp, cool atmosphere that has replaced the lingering humidity of the previous months.
While 15.3 degrees Celsius served as the city‑wide benchmark, Delhi is a sprawling metropolis, and the experience of this cold snap was not uniform. The India Meteorological Department, which monitors weather patterns across various stations in the capital, noted that temperatures across the city fluctuated between 0.4 and 2.3 degrees below normal. In Palam, for instance, the mercury settled at 15.5 degrees Celsius, a reading that landed 2.3 degrees lower than what is typically expected for this time of year.
Monitoring the city’s atmosphere is a complex task, handled by the Central Pollution Control Board through tools like the SAMEER app.
As the temperature has fallen, public attention has also turned toward the quality of the air. Monitoring the city’s atmosphere is a complex task, handled by the Central Pollution Control Board through tools like the SAMEER app. On the same day the temperature hit its three‑year low, the Air Quality Index (AQI) was recorded at 168. In the parlance of air quality monitoring, an AQI of 168 falls into the ‘moderate’ category. While this indicates that the air is not currently at hazardous levels, it remains a point of constant vigilance for city officials and residents alike.
Environmental concerns in Delhi extend beyond the invisible metrics of the AQI. As the city navigates these cooler days, physical evidence of pollution remains a persistent feature of the landscape. Near the Kaili Dweep area, white foam has reappeared on the surface of the Yamuna River. This visible accumulation is a stark reminder of the underlying environmental pressures facing the capital’s water systems, even as the air temperature suggests a change in season.
As Delhi moves further into the autumn, the combination of dropping temperatures and moderate air quality serves as a reminder of the city’s unique environmental rhythm. With the India Meteorological Department continuing to track these deviations from the norm, the city remains in a period of transition. Whether this trend of cooler mornings will persist or the city will see a temporary reprieve remains to be seen, but for now, the record‑breaking chill of October 27 stands as a definitive marker of the season’s arrival.
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