Zwolle's climate is characterized by moderate winters, with temperatures often fluctuating between freezing and mild conditions. Spring arrives in March, bringing warmer temperatures that gradually increase throughout the season, with average highs reaching up to 24°C. Summer months are generally cool, with July being the warmest at around 18°C on average, while August and September see slightly cooler temperatures. Autumn is similar to spring, with moderate temperatures that decrease steadily until winter returns. Winters are typically cold but rarely extremely so, with occasional mild days breaking up the chillier periods.