Legionowo's climate is marked by cold winters, with January and February temperatures averaging around -2°C, and dropping as low as -24°C. Spring brings gradual warming, with March temperatures rising to an average of 3°C and April reaching an average of 7°C. Summer months are mild, with July being the warmest at an average of 22°C, while autumn is cool, with September and October temperatures averaging around 13°C and 9°C respectively. Winter's chill returns in November and December, with temperatures fluctuating between freezing and near-freezing points.