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Rainfall · Tamil Nadu

Rainfall in Perambalur

917 mmof rain in an average year, 2006–2025

Perambalur gets 39% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 877 mm, 4% below average (normal).

Novemberwettest month, 171 mm on average
2021wettest year, 1,421 mm
2016driest year, 511 mm
8months a year with 50 mm of rain or more

Month-wise rainfall in Perambalur

Average rain in each month, 2006–2025.

050100150200JanJan: 15 mmFebFeb: 6 mmMarMar: 18 mmAprApr: 32 mmMayMay: 87 mmJunJun: 57 mmJulJul: 71 mmAugAug: 113 mmSepSep: 112 mmOctOct: 162 mmNovNov: 171 mmDecDec: 72 mm
MonthAverage rainShare of the year
January15 mm2%
February6 mm1%
March18 mm2%
April32 mm3%
May87 mm9%
June57 mm6%
July71 mm8%
August113 mm12%
September112 mm12%
October162 mm18%
November171 mm19%
December72 mm8%

Yearly rainfall in Perambalur since 2006

Lighter bars are dry years, 20% or more below average (2009, 2013, 2014, 2016, 2018), when wells and borewells are drawn hardest. The last ten years averaged 6% more rain than the ten before.

05001000150020062006: 784 mm2007: 897 mm2008: 1,146 mm20092009: 708 mm2010: 1,117 mm2011: 898 mm20122012: 772 mm2013: 714 mm2014: 710 mm20152015: 1,149 mm2016: 511 mm2017: 898 mm20182018: 718 mm2019: 935 mm2020: 997 mm20212021: 1,421 mm2022: 1,075 mm2023: 831 mm20242024: 1,180 mm2025: 877 mm- - average 917 mm

What Perambalur'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 Perambalur sheds about 77,945 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 year1,55,890 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 PerambalurGroundwater level in PerambalurPonds and lakes in PerambalurWater quality in Perambalur

Frequently asked questions

What is the average annual rainfall in Perambalur?

About 917 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 (1,421 mm) and the driest was 2016 (511 mm).

Which month gets the most rain in Perambalur?

November, with 171 mm in an average year, followed by October and August. February is the driest month (6 mm).

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

39% of a normal year's rain falls from June to September. 8 months average 50 mm or more.

How much did it rain in Perambalur in 2025?

877 mm, which is 4% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Perambalur increasing or decreasing?

The last 10 years averaged 6% more rain than the 10 before them. Year-to-year swings are still bigger than that change.

How much rainwater can a house in Perambalur harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Perambalur sheds about 77,945 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 Perambalur 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