Winters in Aalst are generally mild, with temperatures rarely dropping below freezing and averaging around 3-6°C. Spring arrives gradually, with March and April often seeing warm days above 20°C, while May brings more consistent warmth, occasionally reaching highs of up to 26°C. Summers are pleasant, with June and July typically being the warmest months, averaging around 18°C, but not excessively hot. Autumn is similar to spring, with temperatures cooling gradually from September's averages of 16°C, down to November's chill, before warming up again in December. The coldest periods usually occur between January and March, while the warmest months are May through August.