Delhi experienced its highest December rainfall in 15 years, with the Indian Meteorological Department (IMD) recording a total of 42.8 mm of rainfall this month. The city received 9.1 mm of rain in the last 24 hours till 8:30 am on Friday. The unusual weather event not only set a new rainfall benchmark but also caused a significant dip in temperature, marking the lowest maximum temperature for December in the past five years.
Unprecedented Rainfall in December
The December showers have surprised both residents and weather experts. According to the IMD, this is the highest December rainfall recorded in Delhi since 2009. The last significant rainfall for this month was 46 mm, recorded 15 years ago.
While rainfall in December is not unprecedented, the amount received this year is unusually high for what is typically a dry month. The consistent rainfall over the past week has been attributed to an active western disturbance that brought moisture-laden winds over the northern plains of India.
Impact on Day Temperatures
The rainfall has caused a sharp decline in Delhi’s daytime temperatures. On Thursday, the maximum temperature plummeted by 9.5°C, making it the coldest day in December in the past five years.
The IMD noted that the maximum temperature in the city has been hovering around 15°C, significantly below the December average of 21°C. The combination of rainfall and a drop in mercury levels has led to chilly conditions, affecting daily life and prompting residents to bring out heavier winter gear.
Why December Rainfall Matters?
The occurrence of such significant rainfall in December is notable for several reasons:
- Seasonal Rarity:
December is usually part of the post-monsoon season in Delhi, with dry weather prevailing. Rainfall during this time is infrequent and often light. - Agricultural Impact:
The rainfall is likely to have implications for agriculture in surrounding regions. While some farmers may welcome the moisture for winter crops like wheat and mustard, excessive rainfall can lead to waterlogging and crop damage. - Air Quality Relief:
On a positive note, the rainfall has significantly improved Delhi’s air quality. The rains have helped wash away pollutants, bringing the Air Quality Index (AQI) down from the “poor” to the “moderate” category, offering a much-needed respite from the persistent smog.
Delhi’s Weather Patterns in Context
Over the years, Delhi’s weather has shown increasing variability, influenced by factors such as urbanization, climate change, and global weather patterns.
- Western Disturbances:
Western disturbances are a primary cause of rainfall in North India during the winter months. These are extratropical storms originating in the Mediterranean region and bring rain and snow to the Indian subcontinent. - Climate Change Concerns:
Weather experts have pointed out that climate change could be contributing to the altered rainfall patterns, with an increasing frequency of extreme weather events in recent years. - Historical Trends:
IMD data shows that Delhi has experienced significant shifts in its seasonal weather patterns. For instance, the monsoon season has seen both excessive rainfall and prolonged dry spells over the last decade, and similar fluctuations are now being observed in winter weather.
Public Response and Preparations
The unexpected rainfall and drop in temperatures have prompted city authorities to take measures to mitigate its impact. Municipal workers have been deployed to address waterlogging in low-lying areas, while traffic police have issued advisories to ensure smooth commuting.
Meanwhile, residents are adapting to the wet and cold conditions, with many expressing surprise at the unusual weather. “It feels more like January than December,” said a local resident.
A Reminder of Nature’s Unpredictability
Delhi’s record-breaking December rainfall highlights the evolving nature of weather patterns in the region. As residents enjoy the cleaner air and brace for the colder days ahead, the city’s weather serves as a reminder of the need for preparedness and adaptability in the face of changing climatic conditions.