This study examined the rainfall variability among Aus, Aman and Boro season from 1990 to 2020 in Rangpur district of Bangladesh. In this study, rainfall data (1990-2020) was used which gathered from Bangladesh Meteorological Department (BMD). To investigate the seasonal rainfall variation, linear trend analysis was employed. The result of the study exposed that diurnal, monthly and seasonal variation of rainfall were found much anomalies, where annual rainfall increased in Aus and Boro season but decreased in the Aman season. The findings of this research ensure that rainfall has had significant changes in Aus, Aman and Boro season. These changes could have an unfavorable impact on rain-based agriculture in Bangladesh. For sustainable agriculture, various environmental techniques, thresholding, and nationwide rainfall analysis can be useful to support adaptation planning for the rain-driven agricultural economy in Bangladesh.

Key words: Rainfall, season, variability