Gavle's winters are long and cold, with temperatures often below freezing point, averaging around -2°C in January. The coldest months are typically February and December, with average temperatures ranging from -23°C to 11°C and -18°C to 9°C respectively. Spring brings a gradual warming trend, with March and April temperatures rising to an average of 2°C and 4°C respectively. Summer is mild, with July being the warmest month, averaging 19°C, while autumn sees a return to cooler temperatures, with September's average temperature ranging from -1°C to 24°C.