Winters in Creil are cool and occasionally cold, with temperatures often below freezing. Mild days can occur, but the average temperature hovers around 4-6°C. As spring approaches, temperatures gradually rise, reaching averages of 7-12°C by May. Summers are warm to hot, with averages peaking at 18°C in June and July, though temperatures can soar above 25°C on occasion. Autumn is generally mild, with temperatures decreasing steadily until the onset of winter's chill.