Hardenberg's winters are typically cold, with temperatures ranging from -15°C in February to 11°C in January, averaging around 4-6°C. As spring arrives, temperatures gradually rise, reaching averages of 6-11°C by May and June, with occasional highs above 30°C. Summer is mild, with July and August averages around 18°C, but still experiencing warm days up to 27°C. Autumn sees a return to cooler temperatures, averaging around 6-11°C from September to November, before dropping again in winter. The coldest months are usually January and February, while the warmer months are May to October.