Port Huron's winters are harsh and cold, with temperatures often dropping below -20°C in January and February. Spring arrives slowly, with March bringing mild days and April warming up significantly. Summers are warm, but not hot, with July and August averaging around 22-23°C. Autumn is a time of transition, with September and October experiencing cool mornings and warm afternoons. The coldest temperatures are typically seen in December, while the warmest months are June to August.