Slidell's winters are mild, with temperatures rarely dropping below freezing and averaging around 12°C in January. As spring approaches, temperatures gradually warm up, reaching an average of 18°C by March and 19°C by April. Summer months are hot and humid, with July and August often seeing temperatures above 28°C, but a slight dip in September brings the mercury back down to around 25°C. Autumn is characterized by mild temperatures, averaging around 22°C in October before cooling off to around 14°C in November. By December, temperatures have dropped back down to averages around 17°C, marking the beginning of another mild winter.