Trelleborg's winters are chilly, with temperatures often below freezing, but occasional warmer days can bring temperatures up to 13°C in February. Spring brings a gradual warming trend, with April and May seeing significant increases in temperature, reaching averages of 6°C and 11°C respectively. Summer is mild, with July being the warmest month, averaging around 20°C, while August and September experience a slight cooling trend. Autumn is relatively cool, with October and November temperatures dipping back down to averages below 10°C. Winters are again cold, with December temperatures ranging from -9°C to 9°C, but still averaging only 2°C.