Winters in Norwalk are quite chilly, with temperatures often below freezing and averaging around 1-6°C. Spring brings a gradual warming trend, with April and May seeing averages of 11-16°C, but occasional dips into single-digit cold snaps still occur. Summer months are mild to warm, with July and August experiencing highs in the mid-to-high twenties Celsius, while autumns are characterized by a return to cooler temperatures, averaging around 8-17°C, before dipping back down again in winter.