Lomme's climate is characterized by a moderate winter, with temperatures often dropping below freezing in January and February, but gradually warming up towards spring. March and April bring mild temperatures, with occasional warm days, while May marks the beginning of warmer summers, with temperatures frequently reaching into the mid-20s. The peak summer months of June, July, and August are pleasant, with average temperatures around 17°C, although nights can still be cool. Autumn is generally mild, with September being a particularly pleasant month, but October and November see a return to cooler temperatures. Winters are relatively cold, with December temperatures occasionally dipping below zero.