Birganj, Nepal experiences a subtropical climate with distinct seasons. In winter, from January to February, temperatures range from 7-20°C and average around 11-14°C, making it mild but cool. As spring approaches in March and April, temperatures rise significantly, averaging 28-31°C, with frequent heatwaves. Summer months, May to September, bring hot days with temperatures often reaching 36-38°C, although evenings remain relatively cooler. Autumn, from October to December, sees a gentle decline in temperature, ranging from 9-29°C on average, before cooling down into winter again.