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Wildfires in Gunma Prefecture
Detected · VIIRS 375 m · Suomi NPP, NOAA-20, NOAA-21 · last 24 hours · updated 2026-10-12 11:26 UTC
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Fire history, 2012–2025
Detected · VIIRS S-NPP 375 m · 0.01° cells (~1.1 km) · complete years 2012–2025 · built 2026-09-23
Between 2012 and 2025, VIIRS detected fire in 266 km² of Gunma Prefecture at least once. In an average year it detected fire in 34 km², ranking 18th of 47 regions of Japan.
Year by year
Detected area per year, km². Area of 0.01° cells with at least one detection in the year.
The busiest year was 2025, with 45 km² detected; the quietest was 2012, with 19 km². The 2021–2025 average is 25% higher than the 2012–2016 average.
Through the year
Share of all fire-days 2012–2025 by month. A fire-day is one cell with a detection on one day.
April, May and June together hold 39% of the fire-days in the record. The single busiest day was 29 May 2017, with detections in 7 cells.
Ground that burns again
Of the 266 km² with at least one detection, 13% had detections in three or more different years.
| Years with a detection | km² | Share |
|---|---|---|
| 1 year | 181 | 68% |
| 2 years | 50 | 19% |
| 3 to 5 years | 22 | 8.3% |
| 6 to 10 years | 10 | 3.8% |
| 11 years or more | 3.0 | 1.1% |
The half-degree square with the most fire-days is centred at 36.25, 139.25 and holds 79% of the region's fire-days.
The figures
Show the table
| Year | Detected km² | Fire-days |
|---|---|---|
| 2012 | 19 | 57 |
| 2013 | 37 | 97 |
| 2014 | 31 | 92 |
| 2015 | 37 | 110 |
| 2016 | 33 | 59 |
| 2017 | 43 | 85 |
| 2018 | 28 | 58 |
| 2019 | 33 | 61 |
| 2020 | 24 | 41 |
| 2021 | 39 | 63 |
| 2022 | 39 | 60 |
| 2023 | 39 | 70 |
| 2024 | 35 | 54 |
| 2025 | 45 | 71 |
Other regions of Japan
- Kumamoto Prefecture142 km² in an average year
- Fukuoka Prefecture100 km² in an average year
- Hokkaidō96 km² in an average year
- Aichi Prefecture94 km² in an average year
- Chiba Prefecture77 km² in an average year
- Ōita Prefecture72 km² in an average year
- How these figures are madeDetected area, cells, and the single-satellite record.
Detected area counts every 0.01° cell with at least one VIIRS detection, so a small fire counts as a whole cell and a fire missed by cloud or between passes is absent. Borders: Natural Earth 1:10m. 2012 begins on 20 January.