Winters in Union City are quite chilly, with temperatures often dropping below freezing point. January and February are the coldest months, averaging around 2°C and 1°C respectively. Spring brings a gradual warming trend, with March and April temperatures rising to an average of 7°C and 12°C respectively. Summers are mild, with June being the warmest month, averaging 23°C. Autumn is similar to spring in terms of temperature fluctuations, but overall cooler, with October being the closest to winter conditions.