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Rainfall · Tamil Nadu

Rainfall in Thanjavur

1,094 mmof rain in an average year, 2006–2025

Thanjavur gets 27% of its rain from the monsoon, June to September, and November is its wettest month. In 2025 it got 1,281 mm, 17% above average (normal).

Novemberwettest month, 276 mm on average
2021wettest year, 1,644 mm
2016driest year, 641 mm
7months a year with 50 mm of rain or more

Month-wise rainfall in Thanjavur

Average rain in each month, 2006–2025.

0100200300JanJan: 36 mmFebFeb: 13 mmMarMar: 25 mmAprApr: 36 mmMayMay: 78 mmJunJun: 46 mmJulJul: 53 mmAugAug: 96 mmSepSep: 98 mmOctOct: 194 mmNovNov: 276 mmDecDec: 142 mm
MonthAverage rainShare of the year
January36 mm3%
February13 mm1%
March25 mm2%
April36 mm3%
May78 mm7%
June46 mm4%
July53 mm5%
August96 mm9%
September98 mm9%
October194 mm18%
November276 mm25%
December142 mm13%

Yearly rainfall in Thanjavur since 2006

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

050010001500200020062006: 909 mm2007: 978 mm2008: 1,211 mm20092009: 959 mm2010: 1,300 mm2011: 1,011 mm20122012: 846 mm2013: 785 mm2014: 964 mm20152015: 1,426 mm2016: 641 mm2017: 1,051 mm20182018: 839 mm2019: 1,125 mm2020: 1,216 mm20212021: 1,644 mm2022: 1,318 mm2023: 1,146 mm20242024: 1,225 mm2025: 1,281 mm- - average 1,094 mm

What Thanjavur'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 Thanjavur sheds about 92,990 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 year1,85,980 L≈ 19 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 ThanjavurGroundwater level in ThanjavurPonds and lakes in Thanjavur

Frequently asked questions

What is the average annual rainfall in Thanjavur?

About 1,094 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 (1,644 mm) and the driest was 2016 (641 mm).

Which month gets the most rain in Thanjavur?

November, with 276 mm in an average year, followed by October and December. February is the driest month (13 mm).

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

27% of a normal year's rain falls from June to September. 7 months average 50 mm or more.

How much did it rain in Thanjavur in 2025?

1,281 mm, which is 17% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.

Is rainfall in Thanjavur 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 Thanjavur harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Thanjavur sheds about 92,990 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 Thanjavur 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