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 81°F, while the coldest is January averaging around 31°F at night. Precipitation totals about 117 inches a year and is strongly seasonal — June alone averages 22.7 inches while January barely receives 3.47 inches.
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 (°F) | 43 | 46 | 52 | 61 | 69 | 73 | 78 | 81 | 76 | 68 | 58 | 47 |
| Avg temp (°F) | 37 | 38 | 44 | 53 | 61 | 67 | 73 | 74 | 69 | 60 | 50 | 40 |
| Avg low (°F) | 31 | 32 | 37 | 45 | 53 | 61 | 68 | 69 | 63 | 53 | 43 | 34 |
| Precipitation (in) | 3.5 | 5.1 | 8.0 | 10.0 | 10.4 | 22.7 | 20.2 | 12.4 | 10.3 | 5.2 | 4.9 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 46 | 52 | 61 | 69 | 73 |
| Avg temp (°F) | 37 | 38 | 44 | 53 | 61 | 67 |
| Avg low (°F) | 31 | 32 | 37 | 45 | 53 | 61 |
| Precipitation (in) | 3.5 | 5.1 | 8.0 | 10.0 | 10.4 | 22.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 78 | 81 | 76 | 68 | 58 | 47 |
| Avg temp (°F) | 73 | 74 | 69 | 60 | 50 | 40 |
| Avg low (°F) | 68 | 69 | 63 | 53 | 43 | 34 |
| Precipitation (in) | 20.2 | 12.4 | 10.3 | 5.2 | 4.9 | 4.1 |
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 (mph) | 8.4 | 8.1 | 7.6 | 6.3 | 5.0 | 4.6 | 4.7 | 5.1 | 6.0 | 6.9 | 7.2 | 8.2 |
| 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 (mph) | 8.4 | 8.1 | 7.6 | 6.3 | 5.0 | 4.6 |
| 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 (mph) | 4.7 | 5.1 | 6.0 | 6.9 | 7.2 | 8.2 |
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.