UPSC Courses

DNA banner


  • 28 December, 2023

  • 2 Min Read

December rainfall in Tamil Nadu

Tamil Nadu has witnessed heavy rainfall in December 2023.

What is the rainfall pattern in Tamil Nadu?

  • Weather conditions – The state is vulnerable to extreme weather conditions, while coastal districts experience flooding, other areas experience severe droughts.
    • According to IMD, from the year 1951 to 2013, Tamil Nadu has received 47 normal, 8 excess, 6 deficient, and 2 scanty rainfall over a period of time.
  • Annual rainfallAbout 987mm with a range varying from 317.4 mm to 1890.5 mm over the 63 years period (1951-2013).
    • While Nilgiris receives the maximum average annual rainfall, Thoothukkudi and Karur receive the least.
  • Coefficient of variation in annual rainfall – It lies in the range of 0.21 to 0.37 (21 to 37%) across the districts of Tamil Nadu.

What is the rainfall scenario in December 2023?

  • Since October 1, Tamil Nadu has received 450mm of rainfall.
  • Surplus rainfall – Many coastal districts have already received their surplus rainfall.
    • The annual rainfall of Kanyakumari is 760mm, whereas the district has already recorded 1050.7mm during October 1 – December 20, 2023.
  • Deficient rainfall - During the ongoing season (till December 20), only 14 districts out of total 38 have deficient rainfall.
  • Exceptionally heavy rainfall – It occurred in 3 districts of southern Tamil Nadu during December 17–19.
    • IMD stated that these districts had received about 100 per cent or more surplus rain during these 3 days over the previous week (December 6 – 13, 2023).
  • 24-hour time span exceptional rainfall – It was reported by nearly 40 meteorological stations across Thoothukudi (Tuticorin), Thirunelvali and Kanyakumari districts.
    • For example, in Kalyanapattinam, it was 950 mm in December 18th, which is close to the annual rainfall of Lucknow and Ambala (960 mm each) and more than the annual rainfall of Allahabad (918 mm).

What caused the record rainfall over southern TN?

  • Strong northeast monsoon – It remained vigorous over Tamil Nadu since mid-December, bringing in steady rain bands, especially over the south Tamil Nadu and neighbouring Kerala.
  • Movement of cyclonic circulation – It was developed in the southwest Bay of Bengal in December 16, located off the western Sri Lankan coast.
  • As this system moved westwards and reached southern Tamil Nadu, it gave impetus to the northeast monsoon winds, persisted over the southern Tamil Nadu region on December 18 and 19.
  • A heavy cloud convection was observed here, resulting in exceptionally heavy rainfall (more than 200mm in 24 hours) over Thoothukudi, Tirunelveli and Kanyakumari districts of Tamil Nadu and Idukki district of Kerala.


Competition Commission of India (CCI)

Competition Commission of India has selected Ansuman Pattnaik as the new head of its investigation’s unit recently. The Competition Commission of India (CCI) is a statutory body within the Ministry of Corporate Affairs. It was established in 2003, but became fully functional in 2009. The CCI aims to establish a

Connected Lending (CL)

RBI’s move to consolidate the scattered laws on connected lending is welcome. CL refers to persons who are in the position to control the decision of the lender. CL is the extension of credit to individuals or firms connected through ownership or the ability to exert control, whether direct or indirect. CL refers to cases where the

Cosmic Distances

No human probe has travelled much beyond the Solar System, yet we are able to measure distances across billions of light-years. The space beyond Earth is so incredibly vast that units of measure, which are convenient in everyday lives, can become gigantic. Distances between the planets, and especially between the stars, become so big when e

Devil Comet

Mount Everest-sized Devil comet hurtling in Earth’s direction could explode today. Pons-Brooks Comet - Comet 13P/Pons-Brooks, also called the Devil Comet, is about the size of Mount Everest and it is hurtling towards Earth. After an outburst in July, scientists believe that the comet could explode once again today. Ice volcanoe

Kakad Bhairav or Bhilat Baba BHILS

A stone deity worshipped by the Bhils in Madhya Pradesh’s Bagh was recently proved to be a fossilized dinosaur egg. Just like their ancestors worshipped ancient stones as deities, generations of Bhils had worshipped this sunbaked, reddish-brown Kakad Bhairav or Bhilat Baba. Sacrifices of chickens and sheep marked their whispered pleas


01 Feb,2024


Search By Date

Post Feed

Newsletter Subscription
SMS Alerts

Important Links