Winters in Bielsko-Biala are cold, with temperatures often below freezing, but can occasionally rise above 10°C. Spring is a gradual warming period, with temperatures rising steadily throughout March and April, reaching averages of around 6°C by the end of April. Summers are mild to warm, with July being the warmest month, averaging around 21°C. Autumn is generally cooler than spring, with temperatures dropping back down into single digits in November. Frosts can occur even in late summer and early autumn, while winters are often marked by occasional warmer spells.