Unzen, Japan climate
Cfa Humid subtropical
Unzen has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 27°C, while the coldest is January averaging around −1°C at night. Precipitation totals about 2962 mm a year and is strongly seasonal — June alone averages 575 mm while January barely receives 88 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Unzen climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 8 | 11 | 16 | 21 | 23 | 26 | 27 | 25 | 20 | 14 | 9 |
| Avg temp (°C) | 3 | 4 | 7 | 12 | 16 | 19 | 23 | 23 | 20 | 15 | 10 | 5 |
| Avg low (°C) | −1 | 0 | 3 | 7 | 12 | 16 | 20 | 21 | 17 | 12 | 6 | 1 |
| Precipitation (mm) | 88 | 129 | 202 | 253 | 265 | 575 | 514 | 314 | 261 | 133 | 123 | 103 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 8 | 11 | 16 | 21 | 23 |
| Avg temp (°C) | 3 | 4 | 7 | 12 | 16 | 19 |
| Avg low (°C) | −1 | 0 | 3 | 7 | 12 | 16 |
| Precipitation (mm) | 88 | 129 | 202 | 253 | 265 | 575 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 27 | 25 | 20 | 14 | 9 |
| Avg temp (°C) | 23 | 23 | 20 | 15 | 10 | 5 |
| Avg low (°C) | 20 | 21 | 17 | 12 | 6 | 1 |
| Precipitation (mm) | 514 | 314 | 261 | 133 | 123 | 103 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 76 | 74 | 74 | 76 | 80 | 86 | 87 | 83 | 81 | 77 | 75 | 75 |
| Wind speed (km/h) | 13.5 | 13.1 | 12.2 | 10.2 | 8.1 | 7.3 | 7.6 | 8.3 | 9.7 | 11.2 | 11.6 | 13.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 |
| Relative humidity (%) | 76 | 74 | 74 | 76 | 80 | 86 |
| Wind speed (km/h) | 13.5 | 13.1 | 12.2 | 10.2 | 8.1 | 7.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 87 | 83 | 81 | 77 | 75 | 75 |
| Wind speed (km/h) | 7.6 | 8.3 | 9.7 | 11.2 | 11.6 | 13.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Unzendake, about 4 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.