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Rainfall · Tamil Nadu

Rainfall in Karur

791 mmof rain in an average year, 2006–2025

Karur gets 36% of its rain from the monsoon, June to September, and October is its wettest month. In 2025 it got 716 mm, 9% below average (normal).

Octoberwettest month, 149 mm on average
2021wettest year, 1,142 mm
2016driest year, 382 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Karur

Average rain in each month, 2006–2025.

050100150200JanJan: 14 mmFebFeb: 6 mmMarMar: 21 mmAprApr: 36 mmMayMay: 84 mmJunJun: 45 mmJulJul: 53 mmAugAug: 91 mmSepSep: 95 mmOctOct: 149 mmNovNov: 139 mmDecDec: 57 mm
MonthAverage rainShare of the year
January14 mm2%
February6 mm1%
March21 mm3%
April36 mm5%
May84 mm11%
June45 mm6%
July53 mm7%
August91 mm12%
September95 mm12%
October149 mm19%
November139 mm18%
December57 mm7%

Yearly rainfall in Karur since 2006

Lighter bars are dry years, 20% or more below average (2009, 2013, 2016), when wells and borewells are drawn hardest.

05001000150020062006: 738 mm2007: 767 mm2008: 1,033 mm20092009: 597 mm2010: 976 mm2011: 831 mm20122012: 671 mm2013: 609 mm2014: 653 mm20152015: 864 mm2016: 382 mm2017: 774 mm20182018: 677 mm2019: 769 mm2020: 865 mm20212021: 1,142 mm2022: 976 mm2023: 778 mm20242024: 992 mm2025: 716 mm- - average 791 mm

What Karur'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 Karur sheds about 67,235 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 year1,34,470 L≈ 13 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 KarurGroundwater level in KarurPonds and lakes in KarurWater quality in Karur

Frequently asked questions

What is the average annual rainfall in Karur?

About 791 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 (1,142 mm) and the driest was 2016 (382 mm).

Which month gets the most rain in Karur?

October, with 149 mm in an average year, followed by November and September. February is the driest month (6 mm).

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

36% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Karur in 2025?

716 mm, which is 9% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Karur increasing or decreasing?

It has held roughly steady: the last 10 years averaged within 5% of the 10 before them. Year-to-year swings are much bigger than the trend.

How much rainwater can a house in Karur harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Karur sheds about 67,235 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 Karur 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