Winters in Kodaira are chilly, with temperatures often below freezing and averaging around 4°C in January. The cold weather gradually warms up as spring approaches, with March marking a significant increase in temperatures, reaching averages of 12°C. Spring is mild and pleasant, with April and May seeing highs above 20°C and comfortable averages. Summers are hot and humid, with July and August experiencing sweltering temperatures often reaching over 35°C. Autumn brings relief from the heat, but temperatures can drop significantly by October, returning to chilly averages reminiscent of winter.