Slupsk, Poland experiences a cold and variable winter with temperatures ranging from -13°C in February to 9°C in January, averaging around 0-1°C. Spring brings moderate temperatures, increasing gradually from March's average of 3°C to April's 5°C, and May's warmer start at 11°C. Summer is mild, with July being the warmest month, averaging 20°C, while August averages 17°C. Autumn sees a decline in temperature, dropping back down to around 10°C by October before cooling further into winter.