Suginami-ku experiences a distinct seasonal pattern, with cold winters and mild summers. January is the coldest month, with temperatures often below freezing, but February sees a slight improvement in average temperature. Spring arrives in late March, bringing warmer temperatures that steadily rise throughout April and May, with May being the warmest month on record. Summer months of June to August are characterized by high temperatures, particularly in July, which is the hottest month of the year. Autumn brings a return to milder temperatures, with October experiencing cool mornings and warm afternoons before winter sets back in.