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.