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Rainfall · Bihar

Rainfall in Jehanabad

1,022 mmof rain in an average year, 2006–2025

Jehanabad gets 84% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 1,236 mm, 21% above average (excess).

Julywettest month, 268 mm on average
2021wettest year, 1,379 mm
2022driest year, 675 mm
6months a year with 50 mm of rain or more

Month-wise rainfall in Jehanabad

Average rain in each month, 2006–2025.

0100200300JanJan: 10 mmFebFeb: 13 mmMarMar: 12 mmAprApr: 13 mmMayMay: 53 mmJunJun: 149 mmJulJul: 268 mmAugAug: 250 mmSepSep: 189 mmOctOct: 59 mmNovNov: 2 mmDecDec: 4 mm
MonthAverage rainShare of the year
January10 mm1%
February13 mm1%
March12 mm1%
April13 mm1%
May53 mm5%
June149 mm15%
July268 mm26%
August250 mm24%
September189 mm18%
October59 mm6%
November2 mm0%
December4 mm0%

Yearly rainfall in Jehanabad since 2006

Lighter bars are dry years, 20% or more below average (2009, 2010, 2018, 2022, 2023), when wells and borewells are drawn hardest.

05001000150020062006: 1,092 mm2007: 1,258 mm2008: 1,355 mm20092009: 791 mm2010: 749 mm2011: 1,089 mm20122012: 1,061 mm2013: 941 mm2014: 1,102 mm20152015: 995 mm2016: 1,181 mm2017: 953 mm20182018: 721 mm2019: 997 mm2020: 1,220 mm20212021: 1,379 mm2022: 675 mm2023: 817 mm20242024: 820 mm2025: 1,236 mm- - average 1,022 mm

What Jehanabad'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 Jehanabad sheds about 86,870 litres in an average year, most of it in four monsoon 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 year1,73,740 L≈ 17 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.

Frequently asked questions

What is the average annual rainfall in Jehanabad?

About 1,022 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 (1,379 mm) and the driest was 2022 (675 mm).

Which month gets the most rain in Jehanabad?

July, with 268 mm in an average year, followed by August and September. November is the driest month (2 mm).

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

84% of a normal year's rain falls from June to September. 6 months average 50 mm or more.

How much did it rain in Jehanabad in 2025?

1,236 mm, which is 21% above the 2006–2025 average, or "excess" in the India Meteorological Department's terms.

Is rainfall in Jehanabad 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 Jehanabad harvest?

A 100 m² (about 1,076 sq ft) concrete roof in Jehanabad sheds about 86,870 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 Jehanabad 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 Bihar