Winters in Blois are chilly and unpredictable, with temperatures often dropping below freezing, but occasional warmer days can bring temperatures up to 14°C. Spring is a gradual warming period, with March and April showing significant increases in temperature, reaching averages of 7-9°C. Summer brings warmth and stability, with June and July averaging around 19°C, while August is slightly cooler. Autumn is similar to spring, with a slow cooling trend, but temperatures can still drop below freezing by October. The coldest months are December and January, with average temperatures ranging from -5 to 6°C.