Winters in Freiburg im Breisgau are cold and variable, with temperatures often dropping below freezing but occasionally rising into double digits. Spring arrives gradually, with March and April temperatures still quite cool at night but increasingly warm during the day, eventually reaching pleasant highs by May. Summer is mild to warm, with July and August averaging around 18°C, although occasional heatwaves can push temperatures into the mid-30s. Autumn is characterized by a slow cooling trend, with temperatures dropping back into single digits by October but still experiencing some warm days. Winters return in December, marked by chilly nights and mild afternoons that are often just above freezing.