Winters in Joliet are typically cold, with temperatures often below freezing and averaging around -6°C in February. As the season progresses, temperatures slowly rise, with March marking a transition towards milder conditions, averaging around 6°C. Spring brings a noticeable warming trend, with April and May temperatures rising steadily to average highs of 11°C and 15°C respectively. Summers are warm, but not extremely hot, with July and August averaging around 23-25°C. In the fall, temperatures cool down again, with November and December experiencing cold snaps, although averages remain around 3-5°C.