Indian rainfall is irregular and uncertain. 

It will be clear by the given ahead points :

1. Summer monsoon is the rain-bringer in India. The weather in S.W. monsoons is highly variable. It does not rain continuously throughout the period of summer monsoons. There are frequent ‘breaks’ or spells of dry weather, some of them lasting several days. This breaks the continuity of rain by S.W. monsoons.

2. The summer monsoons do not have great amount of moisture to give heavy rainfall. The amount of rainfall is increased by tropical depressions, convectional system, and jet stream. These cyclones are irregular and have a fluctuating pattern. The frequency of these cyclones determines the height of rainy season. The absence of these leads to a dry spell.

3. The number of rainy days sometimes increase and sometimes decrease. Some years, it is heavy rainfall, but some years get light rainfall. The start and end of monsoons is early or late. Some areas get high rainfall some areas remain dry.