Winters in Choisy-le-Roi are chilly and unpredictable, with temperatures often dropping below freezing but occasionally rising into the mid-teens. Mornings can be frosty, while afternoons may see a slight warming trend. Spring arrives gradually, with March and April bringing warmer days, sometimes reaching into the mid-twenties, but still experiencing cooler nights. Summer months are mild, with highs in the late twenties to early thirties, and occasional overnight dips into single digits. Autumn is characterized by cooling temperatures, with daytime highs dipping back down towards average winter levels as the season progresses.