Trondheim's winters are harsh, with temperatures often dropping below -20°C in January and February, but can briefly rise to around 10-12°C. As spring approaches, March brings mild temperatures, averaging around 3°C, while April and May see a gradual warming trend, reaching average highs of 9°C and 13°C respectively. Summer months, June to August, are characterized by relatively warm temperatures, with July being the warmest month, averaging 16°C. Autumn is cool and wet, with temperatures gradually dropping from around 11°C in September to 8°C in October, before descending into winter conditions again.