Typhoon approach calendar for Izu and Ogasawara Islands
Period: finalized records for 1951–2025 (75 years)
The Japan Meteorological Agency (JMA) normal (1991–2020) is 5.4 per year, second only to Okinawa. In the 1951–2025 records, approaches have been recorded from April to December, and October also has 131 days in total; the length of the typhoon season stands out.
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 Izu and Ogasawara Islands, 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 September 19: 12 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 | 11 days | 8 days |
| May | 24 days | 14 days |
| June | 37 days | 18 days |
| July | 106 days | 49 days |
| August | 207 days | 66 days |
| September | 183 days | 82 days |
| October | 131 days | 58 days |
| November | 33 days | 8 days |
| December | 6 days | 3 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 Izu and Ogasawara Islands is 5.4.
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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