Winters in Lelystad are cool and unpredictable, with temperatures often dropping below freezing point but occasionally rising above average. Spring arrives slowly, with March marking the beginning of a gradual warming trend that continues through April and May. Summer brings pleasant warmth, with June and July averaging around 18°C, although occasional heatwaves can push temperatures into the mid-20s. Autumn is generally mild, with September being one of the warmer months, but temperatures drop significantly in October and November before stabilizing again in December.