Tsukubamirai's winters are cold and unpredictable, with temperatures fluctuating between -7°C and 18°C. Spring brings gradual warming, with temperatures rising steadily from around 2°C in April to a peak of up to 26°C. Summer is hot and humid, with July being the warmest month, averaging 25°C, while August often sees temperatures soar above 30°C. Autumn cools down significantly, with temperatures dropping back into single digits by November, before warming up again in December. The year's temperature range is quite wide, spanning from -7°C to 39°C.