Thessaloniki's winters are cool and sometimes cold, with temperatures often below freezing in January and December, but can rise to mild highs. Spring brings gradual warming, with March being a turning point, and April and May becoming increasingly warm and sunny. Summer is hot and dry, with July and August seeing the highest temperatures, while September marks a slight cooling trend before autumn sets in. Autumn is generally pleasant, with October and November experiencing mild temperatures, but can also be cool and rainy at times.