Winters in Lambersart are cool and variable, with temperatures often below freezing but occasionally rising into the mid-teens. Spring arrives slowly, with temperatures gradually warming up over March and April, reaching an average of around 7°C by May. Summer is mild, with July and August temperatures averaging a comfortable 17°C, while September brings a slight cooling trend. Autumn is relatively cool, with October temperatures often hovering just above freezing before dropping again in November.