Climate comfort
JMA 1991–2020 daily normals for temperature and precipitation. Historical normals are not a forecast.
Transparent by design · Score v0.2
What the risk score means—and what it does not.
Each candidate period receives a 0–100 planning-risk score. Lower means fewer date-specific planning frictions in the bundled data; it does not promise better weather, fewer people, or a better trip.
Score composition
Four visible factors, one comparative result
Calendar pressure
Weekends, Japan's official national holidays, and consecutive days off within each exact window.
Major published events
Only manually reviewed official event records. This is a planning signal, not an attendance or live-crowd prediction.
Visitor seasonality
A 2019 pre-pandemic national monthly visitor-arrival baseline from JNTO, used comparatively rather than as a current visitor count.
A difference below 5 points is reported as a tie. When either window falls outside reviewed event coverage, the event factor is removed from both candidates and the other three weights are proportionally normalized.
Data status
Freshness and coverage
Built 2026-07-19. National holidays cover 2026-01-01 through 2027-12-31; climate data uses 1991-2020 daily normals; reviewed event scoring covers 2026-07-18 through 2026-12-31. Annual future schedules can appear as context but remain unscored until a year-specific review.
Primary sources
Official data, stored as a versioned snapshot
- Cabinet Office of Japan national holidays
- Japan Meteorological Agency historical normals
- Japan National Tourism Organization visitor statistics
- Official event source
- Official event source
- Official event source
- Official event source
- Official event source
- Official event source
- Official event source
This independent validation edition runs from bundled static data. No runtime AI, paid API, live weather feed, or live crowd feed is involved.
Corrections
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