Rainfall in Udalguri
Udalguri gets 62% of its rain from the monsoon, June to September, and June is its wettest month. In 2025 it got 1,481 mm, 16% below average (normal).
Month-wise rainfall in Udalguri
Average rain in each month, 2006–2025.
| Month | Average rain | Share of the year |
|---|---|---|
| January | 6 mm | 0% |
| February | 19 mm | 1% |
| March | 50 mm | 3% |
| April | 185 mm | 10% |
| May | 286 mm | 16% |
| June | 363 mm | 21% |
| July | 303 mm | 17% |
| August | 230 mm | 13% |
| September | 203 mm | 12% |
| October | 104 mm | 6% |
| November | 10 mm | 1% |
| December | 5 mm | 0% |
Yearly rainfall in Udalguri since 2006
Lighter bars are dry years, 20% or more below average (2021, 2023), when wells and borewells are drawn hardest.
What Udalguri'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 Udalguri sheds about 1,49,770 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 Udalguri?
About 1,762 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 (2,193 mm) and the driest was 2023 (1,123 mm).
Which month gets the most rain in Udalguri?
June, with 363 mm in an average year, followed by July and May. December is the driest month (5 mm).
How much of Udalguri's rain falls in the monsoon?
62% of a normal year's rain falls from June to September. 8 months average 50 mm or more.
How much did it rain in Udalguri in 2025?
1,481 mm, which is 16% below the 2006–2025 average, or "normal" in the India Meteorological Department's terms.
Is rainfall in Udalguri 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 Udalguri harvest?
A 100 m² (about 1,076 sq ft) concrete roof in Udalguri sheds about 1,49,770 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 Udalguri district. It reads close to, but not exactly the same as, India Meteorological Department rain-gauge totals, and rain varies within a district.