Winters in Conflans-Sainte-Honorine are generally cool, with temperatures often dropping below freezing point, averaging around 4-6°C. Spring arrives slowly, with temperatures gradually warming up towards the end of March and April, reaching averages of 7-8°C. Summer is mild to warm, with July and August being the warmest months, but still within a comfortable range of 17-19°C. Autumn is similar to spring, with temperatures cooling down again, averaging around 6-11°C.