Delhi Records Coldest December Day

Weather and Climate Data in Delhi

1. Temperature Records:

   • Coldest December day in six years recorded in Delhi with a maximum temperature of 14.2 degrees Celsius on December 31, 2025.
   • This temperature is 6.2 degrees below the normal maximum for the date.
   • Minimum temperature recorded at 6.4 degrees Celsius.
   • Previous record of lowest maximum temperature was 9.4 degrees Celsius on December 31, 2019.

2. Criteria for Cold Day Declaration:

   • A "cold day" is defined when the minimum temperature is below 10 degrees Celsius and the maximum temperature is more than 4.5 degrees Celsius below normal.

3. Air Quality Index (AQI) Trends:

   • Delhi recorded the lowest annual average AQI in seven years in 2025, except for the year 2020 which was influenced by the COVID-19 pandemic.
   • The monthly average AQI for December 2025 was reported at 351 due to low wind speeds and unfavourable meteorological conditions.

Regulatory Body:

• The Commission for Air Quality Management (CAQM) in the National Capital Region and Adjoining Areas is responsible for monitoring and reporting on air quality.

Climate Implications:

• The decrease in temperature and poor AQI indicates potential climate-related challenges and stresses the need for effective environmental policies and responses to combat air pollution and its health effects.

Conclusion:

• The meteorological data from Delhi highlights extreme weather events and air quality issues, emphasizing the importance of climate action and monitoring in urban areas.