Tachikawa's winters are long and frigid, with temperatures often dropping below -30°C in January and February. Spring brings a gradual warming, with April marking the beginning of mild temperatures ranging from 0-26°C. Summer is hot and humid, with July and August averaging highs above 35°C, while autumn cools down to more moderate temperatures around 10-20°C by October. The winter chill returns in November, with temperatures plummeting back below -20°C.