Rainfall in Mon
Mon gets 66% of its rain from the monsoon, June to September, and July is its wettest month. In 2025 it got 2,279 mm, 16% above average (normal).
Month-wise rainfall in Mon
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 14 mm | 1% |
| February | 34 mm | 2% |
| March | 71 mm | 4% |
| April | 173 mm | 9% |
| May | 246 mm | 13% |
| June | 343 mm | 17% |
| July | 367 mm | 19% |
| August | 323 mm | 16% |
| September | 255 mm | 13% |
| October | 113 mm | 6% |
| November | 16 mm | 1% |
| December | 10 mm | 1% |
Yearly rainfall in Mon since 2006
Lighter bars are dry years, 20% or more below average (2006, 2007), when wells and borewells are drawn hardest. The last ten years averaged 12% more rain than the ten before.
What Mon'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 Mon sheds about 1,66,940 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 Mon?
About 1,964 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 2010 (2,470 mm) and the driest was 2006 (1,191 mm).
Which month gets the most rain in Mon?
July, with 367 mm in an average year, followed by June and August. December is the driest month (10 mm).
How much of Mon's rain falls in the monsoon?
66% of a normal year's rain falls from June to September. 8 months average 50 mm or more.
How much did it rain in Mon in 2025?
2,279 mm, which is 16% above the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Mon increasing or decreasing?
The last 10 years averaged 12% more rain than the 10 before them. Year-to-year swings are still bigger than that change.
How much rainwater can a house in Mon harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Mon sheds about 1,66,940 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 Mon district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.