Nishitokyo experiences a distinct seasonal pattern, with cold winters and warm summers. January and December are the coldest months, with temperatures rarely rising above 18°C or falling below -7°C. Spring arrives in March, bringing mild temperatures ranging from -1°C to 24°C, while autumn's warmth is short-lived, with October temperatures fluctuating between 5°C and 30°C before dropping again. Summer heat peaks in July and August, with temperatures often soaring above 36°C, but the mercury drops significantly by September.