Jena's winters are typically cold and unpredictable, with temperatures often dropping below freezing but occasionally rising into double digits. As the months warm up in spring, temperatures steadily increase, reaching a peak in June, which is usually the warmest month of the year. Summer days are generally mild, with highs around 29C, while autumn brings more moderate temperatures before dropping again in winter. The temperature fluctuations between seasons can be significant, but overall Jena experiences a temperate climate with cold winters and warm summers.