Bialystok's winters are harsh, with temperatures often plummeting below -20°C in January and February. As spring approaches, temperatures gradually warm up, reaching averages around 0-5°C by March and April. Summer months bring pleasant warmth, with July being the warmest month, averaging around 21°C, but temperatures still fluctuate within a relatively narrow range. Autumn is mild, with temperatures dropping back down to around 0-10°C in October and November. Winters return in December, bringing cold snaps that can dip below -15°C.