Deventer's winters are cold and unpredictable, with temperatures often dropping below freezing but occasionally rising into double digits. Spring brings a gradual warming trend, with temperatures gradually increasing over the months of March and April. Summer is mild and pleasant, with warmest days in June reaching highs of 34C, although nights can still be cool. Autumn sees a return to cooler conditions, with temperatures dropping back down by October, but remaining relatively stable through November and December. Overall, the temperature fluctuations are moderate, with average monthly temperatures rarely straying far from around 5-11 degrees Celsius.