Winters in Ostrowiec Swietokrzyski are cold and snowy, with temperatures often dropping below 0°C, averaging around -2°C. The coldest months are January and February, with temperatures ranging from -21°C to 18°C. Spring arrives slowly, with March temperatures gradually warming up to an average of 3°C, while April sees a further increase to 6°C. Summer is warm and pleasant, with July being the hottest month, averaging around 22°C, but temperatures can still reach as high as 34°C in June. Autumn brings mild temperatures, ranging from -5°C to 26°C, before dropping back down again in winter.