Winters in Ageoshimo are cold and often see temperatures below freezing, with January averaging around 4°C. As the season progresses, February sees a slight warming trend before dropping again in March, which still experiences some chilly days but averages around 11°C. Spring brings rapid temperature increases, with April and May seeing significant rises to average highs of 14°C and 19°C respectively. Summers are hot and humid, with July and August often reaching temperatures above 30°C, although August's record high is slightly lower than July's. Autumn cools down significantly, returning to winter-like conditions by November, which sees some frosty mornings but averages around 12°C overall.