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Rainfall · Tamil Nadu

Rainfall in Sivagangai

944 mmof rain in an average year, 2006–2025

Sivagangai gets 27% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 1,065 mm, 13% above average (normal).

Novemberwettest month, 218 mm on average
2021wettest year, 1,375 mm
2016driest year, 485 mm
6months a year with 50 mm of rain or more

Month-wise rainfall in Sivagangai

Average rain in each month, 2006–2025.

0100200300JanJan: 27 mmFebFeb: 11 mmMarMar: 23 mmAprApr: 42 mmMayMay: 78 mmJunJun: 37 mmJulJul: 46 mmAugAug: 85 mmSepSep: 90 mmOctOct: 182 mmNovNov: 218 mmDecDec: 107 mm
MonthAverage rainShare of the year
January27 mm3%
February11 mm1%
March23 mm2%
April42 mm4%
May78 mm8%
June37 mm4%
July46 mm5%
August85 mm9%
September90 mm10%
October182 mm19%
November218 mm23%
December107 mm11%

Yearly rainfall in Sivagangai since 2006

Lighter bars are dry years, 20% or more below average (2009, 2012, 2013, 2016, 2018), when wells and borewells are drawn hardest. The last ten years averaged 11% more rain than the ten before.

05001000150020062006: 1,024 mm2007: 821 mm2008: 1,046 mm20092009: 696 mm2010: 1,114 mm2011: 851 mm20122012: 648 mm2013: 664 mm2014: 884 mm20152015: 1,188 mm2016: 485 mm2017: 802 mm20182018: 714 mm2019: 951 mm2020: 1,051 mm20212021: 1,375 mm2022: 1,275 mm2023: 1,138 mm20242024: 1,089 mm2025: 1,065 mm- - average 944 mm

What Sivagangai's rain is worth to a building

Every millimetre of rain on a square metre of roof is a litre of water. A 100 m² roof in Sivagangai sheds about 80,240 litres in an average year, most of it in a few wet months. Sent into a recharge pit, it refills the ground instead of flooding the street.

Your building: how much can you recharge?

Water you can put back each year1,60,480 L≈ 16 water tankers of 10,000 L

1 mm of rain on 1 m² is 1 litre. The surface factor allows for water lost to splash, evaporation and first-flush.

Rainwater harvesting cost in SivagangaiGroundwater level in SivagangaiPonds and lakes in Sivagangai

Frequently asked questions

What is the average annual rainfall in Sivagangai?

About 944 mm a year, averaged over 2006–2025 from NASA POWER satellite and weather-model data for the centre of the district. The wettest year in that time was 2021 (1,375 mm) and the driest was 2016 (485 mm).

Which month gets the most rain in Sivagangai?

November, with 218 mm in an average year, followed by October and December. February is the driest month (11 mm).

How much of Sivagangai's rain falls in the monsoon?

27% of a normal year's rain falls from June to September. 6 months average 50 mm or more.

How much did it rain in Sivagangai in 2025?

1,065 mm, which is 13% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Sivagangai increasing or decreasing?

The last 10 years averaged 11% more rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Sivagangai harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Sivagangai sheds about 80,240 litres in an average year: area × rainfall × 0.85 for splash and evaporation. Sent into a recharge pit, that refills the ground under the house instead of running into the drain.

Rainfall from NASA POWER (bias-corrected satellite and weather-model rainfall) at the centre of Sivagangai district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.

Rainfall in other districts of Tamil Nadu