4.1 Temporal Variation of Rainfall during Monsoon and Non-Monsoon Season
It is necessary to assess the seasonal variation of rainfall to know the months in which maximum and minimum precipitation is received. Spatial and temporal variation together will give us a clearer picture about the precipitation trend for the study area. It is obvious that all the districts will not receive the same maximum precipitation at the same time everywhere. To analyse it, it is necessary that we should plot the temporal variation of the rainfall in the study area. The figures below show how the monthly average rainfall varies in Assam from January till December. As we have discussed that IDW gives a more reliable result in comparison to other methods, is used to plot the average monthly spatial variation of precipitation in Assam.
The monsoon season in Assam starts with May and lasts till October. Therefore, knowledge of spatial variation and amount of rainfall during these seasons is more crucial. The figures below show the spatio-temporal variation of rainfall during monsoon season.