Pori's winters are long and cold, with temperatures often dropping below -20°C in January and February. Spring brings a slow warming trend, with April and May temperatures rising steadily into the double digits. Summer is mild, with July being the warmest month, but still relatively cool compared to other parts of Europe. Autumn is another transitional season, with temperatures fluctuating wildly from one day to the next. By November and December, the cold sets in once more, with occasional brief periods of milder weather.