Alton experiences a moderate climate with distinct seasonal changes. Winters are cold, with temperatures often below freezing, but occasional warm spells bring temperatures up to around 20°C in February and 12°C in January. Spring arrives in March, bringing increasing warmth, with temperatures rising to an average of 10°C. Summer is mild, with July and August being the warmest months, averaging around 26°C, while autumn sees a gradual cooling trend, with temperatures dropping back down to around 7°C by November and December.