Rainfall in Ri Bhoi
Ri Bhoi gets 63% of its rain from the monsoon, June to September, and June is its wettest month. In 2025 it got 1,926 mm, 4% below average (normal).
Month-wise rainfall in Ri Bhoi
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 7 mm | 0% |
| February | 20 mm | 1% |
| March | 55 mm | 3% |
| April | 198 mm | 10% |
| May | 313 mm | 16% |
| June | 415 mm | 21% |
| July | 348 mm | 17% |
| August | 280 mm | 14% |
| September | 227 mm | 11% |
| October | 126 mm | 6% |
| November | 10 mm | 0% |
| December | 7 mm | 0% |
Yearly rainfall in Ri Bhoi since 2006
Lighter bars are dry years, 20% or more below average (2006), when wells and borewells are drawn hardest. The last ten years averaged 18% more rain than the ten before.
What Ri Bhoi'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 Ri Bhoi sheds about 1,70,425 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 Ri Bhoi?
About 2,005 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 2020 (2,765 mm) and the driest was 2006 (1,531 mm).
Which month gets the most rain in Ri Bhoi?
June, with 415 mm in an average year, followed by July and May. January is the driest month (7 mm).
How much of Ri Bhoi's rain falls in the monsoon?
63% of a normal year's rain falls from June to September. 8 months average 50 mm or more.
How much did it rain in Ri Bhoi in 2025?
1,926 mm, which is 4% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Ri Bhoi increasing or decreasing?
The last 10 years averaged 18% more rain than the 10 before them. Year-to-year swings are still bigger than that change.
How much rainwater can a house in Ri Bhoi harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Ri Bhoi sheds about 1,70,425 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 Ri Bhoi district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.