Investigation of Rainfall Variability Across Different Region in Paser Regency-East Kalimantan, Indonesia

Study of climatology parameters such as rainfall variability is closely related to climate change in a region, and its analysis is very useful in monitoring water availability for agriculture, especially for rice paddies. This study aims to analyze rainfall variability, focusing on the Paser Regency area. This study uses available rainfall data from 18 rainfall observation stations in Paser Regency and other nearby regions at East Kalimantan. The rainfall data obtained varied from 10 years to more than 70 years and was was analyzed using simple statistical analysis, including annual, monthly, and daily averages. The mean of monthly and annual rainfall was calculated to check the rainfall. The rainfall analysis results show that Paser Regency receives an average annual rainfall of 2,275 mm/year, with an average number of rainy days of 143.5 days/year and a monthly average of 190 mm/month, with two distinct rainy periods.