Winters in Belfort, France are cold and variable, with temperatures often below freezing but occasionally rising into the mid-teens. Spring brings a gradual warming trend, with temperatures slowly increasing over the months of March and April. Summers are mild to warm, with July and August averaging around 18°C, while September begins to cool down again. Autumn is characterized by a return to cooler temperatures, with October and November often seeing nighttime lows below freezing. The coldest months are January and December, while the mildest month is June.