Winters in Tczew are long and cold, with temperatures often dropping below -20°C in January and February. Spring arrives slowly, with March bringing mild days and April warming up significantly. Summers are warm but not hot, with July being the hottest month at around 20°C on average. Autumn is a gentle transition back to cooler temperatures, with October and November experiencing crisp mornings and mild afternoons. Decembers can be quite cold once again, with temperatures occasionally plummeting below -18°C.