Vantaa's winters are harsh and cold, with temperatures often dropping below -20°C in January and February. As spring arrives in March, temperatures begin to rise, but still fluctuate between freezing and mild days. Summer brings warmth, with July being the warmest month, with average highs around 21°C. Autumn is relatively cool, with temperatures gradually decreasing towards winter conditions by October and November. The temperature usually remains below freezing from December to February, with January often being the coldest month.