Nature of climate parameter of Bangladesh and their changes over 1950-1970

This study examines long-term climate trends in Bangladesh using three-hourly meteorological data from five stations between 1950 and 2020. Key variables analyzed include dry-bulb temperature (mean, maximum, and minimum), wet-bulb temperature, relative humidity, daily rainfall, wind speed, and wind flow direction. The results indicate a rising trend in mean dry-bulb temperature at three inland stations, while coastal stations exhibited nonlinear trends. Maximum temperatures showed a decline, whereas minimum temperatures increased over the seventy-year period. Relative humidity generally decreased, though one station displayed fluctuating trends. Annual rainfall remained stable, but daily rainfall exhibited intra-annual variability, with alternating increases and decreases throughout the year. Wind patterns varied across stations, with no consistent trend in speed, though monsoon-driven wind direction shifts occurred later in recent decades. A comparison between earlier and later years revealed increased dry-bulb temperatures and decreased relative humidity, while rainfall and wind flow changes lacked a uniform pattern. A comparison of wind flow direction reveals that in the later years the reversal in direction of wind flow is delayed into the year. These findings enhance understanding of regional climate dynamics and can support climate change adaptation and mitigation strategies in Bangladesh.