Hamburg, United States experiences a moderate climate with distinct seasonal changes. Winters are cold and frosty, with temperatures often below freezing, especially in January and February, but gradually warming up towards the end of March. Spring arrives in April and May, bringing mild temperatures with occasional warm days, while summers are warm to hot, with July and August being the warmest months. Autumn is characterized by a gradual cooling down, with September and October temperatures similar to those in spring, before dropping again in November and December.