Typhoon approach calendar for Shikoku
Period: finalized records for 1951–2025 (75 years)
The Japan Meteorological Agency (JMA) normal (1991–2020) is 3.3 per year. In the 1951–2025 records, a little over 80% of all approaches are concentrated in July–September, and October also has 42 days of approaches in total.
Figures in the text are based on records collected as of September 2026 (1951–2025 totals).
An "approach" is counted on each date when the center of a typhoon came within 300 km of any staffed weather station in Shikoku, following the JMA definition. Preliminary values for the current year are not included.
These are statistics compiled from observations for 1951–2025 (75 years), not a weather forecast for any particular day. For the latest forecasts, see the JMA website.
Approaches by date (times in the past 75 years)
By date, approaches were most frequent on August 22: 9 times in 1951–2025 (75 years).
Uncolored cells mean 0 approaches on that date in the past 75 years. The table below has the values for each month.
Total approach days by month
| Month | 1951–2025 | 1996–2025 |
|---|---|---|
| January | 0 days | 0 days |
| February | 0 days | 0 days |
| March | 0 days | 0 days |
| April | 1 day | 0 days |
| May | 4 days | 3 days |
| June | 24 days | 10 days |
| July | 86 days | 31 days |
| August | 147 days | 52 days |
| September | 114 days | 49 days |
| October | 42 days | 20 days |
| November | 2 days | 0 days |
| December | 0 days | 0 days |
Total approach days are the sum of approach dates over all years. A typhoon that approached on 2 days counts as 2 days. Bar lengths are relative to the month with the most days in each column. The 2 columns cover different numbers of years, so compare lengths only within the same column (they still show in which month the peak falls). The JMA normal (1991–2020) for annual approaches to Shikoku is 3.3.
Smoothed share of years with an approach (1996–2025)
The share of years with an approach on each date, smoothed over 4 days on each side (most recent 30 years). For the raw records by date, the counts in the calendar above are authoritative.
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