Rainfall in Dhanbad
Dhanbad gets 80% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 1,458 mm, 9% above average (normal).
Month-wise rainfall in Dhanbad
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 11 mm | 1% |
| February | 14 mm | 1% |
| March | 18 mm | 1% |
| April | 32 mm | 2% |
| May | 93 mm | 7% |
| June | 202 mm | 15% |
| July | 320 mm | 24% |
| August | 296 mm | 22% |
| September | 251 mm | 19% |
| October | 91 mm | 7% |
| November | 7 mm | 1% |
| December | 8 mm | 1% |
Yearly rainfall in Dhanbad since 2006
Lighter bars are dry years, 20% or more below average (2010), when wells and borewells are drawn hardest. The last ten years averaged 9% more rain than the ten before.
What Dhanbad'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 Dhanbad sheds about 1,14,155 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?
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 Dhanbad?
About 1,343 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 (1,744 mm) and the driest was 2010 (868 mm).
Which month gets the most rain in Dhanbad?
July, with 320 mm in an average year, followed by August and September. November is the driest month (7 mm).
How much of Dhanbad's rain falls in the monsoon?
80% of a normal year's rain falls from June to September. 6 months average 50 mm or more.
How much did it rain in Dhanbad in 2025?
1,458 mm, which is 9% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Dhanbad increasing or decreasing?
The last 10 years averaged 9% more rain than the 10 before them. Year-to-year swings are still bigger than that change.
How much rainwater can a house in Dhanbad harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Dhanbad sheds about 1,14,155 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 Dhanbad district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.