If you are now in Japan, I surely believe you feel climate transition in a week.
Cherry blossms are atrating to bloom, and we can begin to feel the arrival of spring.

Sansan-shion, often described as “three cold days followed by four warm days,” encapsulates the unique climate pattern experienced in Japan, especially during the transition from winter to spring. Originally derived from Chinese weather observations, the term has been embraced in Japan to describe a distinctive seasonal phenomenon.

1. What is Sansan-shion?

Sansan-shion refers to a weather cycle where temperatures alternate between colder days and warmer days. It serves as a subtle indicator of the gradual shift toward spring, a time when the contrast between chilly mornings and mild afternoons becomes noticeable.

2. The Science Behind Sansan-shion

This phenomenon occurs due to Japan’s geographic location and climate. Cold air masses from the north interact with warmer air masses from the south, resulting in fluctuating temperatures. The intricate balance between these forces makes Sansan-shion particularly prominent in regions like Honshu.

3. Cultural Resonance of Sansan-shion

Japanese life and traditions reflect the influence of Sansan-shion:

• Seasonal Foods: Spring vegetables start appearing on warm days, while colder days inspire dishes like hotpot and oden.
• Fashion Adaptations: Layered clothing becomes a necessity to navigate temperature shifts.
• Nature Observations: Warm days bring blooming flowers, while colder days offer a chance to appreciate frost-covered landscapes.

4. Experiencing Sansan-shion

To truly appreciate this seasonal transition, try keeping a journal to track daily temperatures or observe how flora and fauna respond to the changing weather. It’s a wonderful way to connect with nature and see the arrival of spring through a fresh lens.

5. Climate Change and Sansan-shion

As global climate patterns evolve, the traditional rhythm of Sansan-shion may be affected. Observations suggest shorter cycles and increased unpredictability, prompting discussions about environmental impact and preservation.