Tomakomai, Japan experiences cold winters with January and February temperatures averaging around -6°C and -3°C respectively. Spring brings mild temperatures in March and April, warming up to averages of 3°C and 7°C as the season progresses. Summer is warm and humid, with July being the hottest month at an average high of 22°C. Autumn sees a gentle decline in temperature from September to November, with October averaging around 12°C before dropping back down to winter conditions by December.