Bacau's winters are harsh, with temperatures often below freezing and occasional warm spells that bring temperatures up to around 12°C. As spring approaches, temperatures gradually rise, but March still sees some chilly days. April is a transition month, with mild temperatures allowing for more sunshine, while May is warmer, with average highs reaching 15°C. Summer brings warmth, with July being the hottest month, but even then, nighttime temperatures don't drop below 13°C. Autumn is similar to spring, with temperatures gradually cooling down as winter approaches again.