Winters in Caldwell are quite chilly, with temperatures often below freezing and averaging around 1°C. Spring brings a gradual warming trend, with temperatures rising to an average of 9°C by April, but still experiencing occasional cold snaps. Summer is the warmest season, with July being the hottest month on average at 27°C, while August's average temperature is slightly lower. Autumn sees a return to milder conditions, with October averaging around 11°C before temperatures drop again in November and December.