Archive of measured data
These are past measurements collected from dive-shop logs. They are not a forecast — the visibility forecast service has ended.
See the dive calculatorsMeasurement archive
Visibility and water-temperature measurements collected from dive-shop logs across Japan since 2006 — 43,402 records across 38 sites. Collection has ended, so this is the whole of what was recorded rather than a growing figure.
- Best season at a glanceMonthly average visibility for every site
- On this dayVisibility recorded on this date in past years
- Best of this monthSites that averaged best this month
- Data sourcesThe dive-shop logs the records came from
Per-site records are reachable fromthe best-season table. The daily visibility forecast itself has ended.