Rainfall in West Kameng
West Kameng gets 68% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 1,234 mm, 4% below average (normal).
Month-wise rainfall in West Kameng
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 7 mm | 1% |
| February | 16 mm | 1% |
| March | 34 mm | 3% |
| April | 104 mm | 8% |
| May | 167 mm | 13% |
| June | 255 mm | 20% |
| July | 266 mm | 21% |
| August | 194 mm | 15% |
| September | 156 mm | 12% |
| October | 68 mm | 5% |
| November | 11 mm | 1% |
| December | 6 mm | 0% |
Yearly rainfall in West Kameng since 2006
Lighter bars are dry years, 20% or more below average, when wells and borewells are drawn hardest.
What West Kameng'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 West Kameng sheds about 1,09,140 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 West Kameng?
About 1,284 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 2024 (1,545 mm) and the driest was 2021 (1,054 mm).
Which month gets the most rain in West Kameng?
July, with 266 mm in an average year, followed by June and August. December is the driest month (6 mm).
How much of West Kameng's rain falls in the monsoon?
68% of a normal year's rain falls from June to September. 7 months average 50 mm or more.
How much did it rain in West Kameng in 2025?
1,234 mm, which is 4% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in West Kameng 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 West Kameng harvest?
A 100 m² (about 1,076 sq ft) concrete roof in West Kameng sheds about 1,09,140 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 West Kameng district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.