Annual Precipitation  

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  • Average Annual Precipitation 4000 Billion Cubic Meters
  • Distribution of Rainfall is very uneven in space and time
  • Very high Variability from year to year
  • Most of the rainfall occurs in about four monsoon months in a few spell
  • Total rainfall hours about 100 hours

The country has a diverse landscape and a climate varying from the areas with highest rainfall such as Mawsynram near Cherrapunji (Meghalaya) to the driest parts of western Rajasthan with negligible rain and from a hot and humid southern peninsula to the snowbound Himalayan Mountains. Broadly, the climate of India is of the tropical monsoon type. It has four seasons: winter (January–February), a hot summer (March–May), rainy southwest monsoon (June–September), and post-monsoon (October–December). The climate is affected by two seasonal winds: the southwest monsoon and the northeast monsoon. The distribution of rainfall is very uneven in terms of time and space. About 72 percent of the area receives an annual rainfall of no more than 1 150 mm.

Distribution of Area According to Annual Rainfall

Category Rainfall (mm) Area (%)
Dry 0–750 30
Medium 750–1 50 42
1 150–2 000 20
Assured > 2 000 8
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Mar-May Jun-Sep



Homogeneous Monsoon Regions

Homogeneous Indian Monsoon Regions

Core Monsoon Regions of India

Spatial Distribution of Rainfall

(Source :

  Some Facts

Highest Recorded Point Rainfalls (≥50cm) for One Day Duration (1875 to 1990)

Selected Stations in the Himalayan Regions Recording ≥25cm of Rainfall for One Day

Variability of Precipitation Over Different Longitudinal Sections of Himalayas (From South to North)