Unnan, Japan climate
Cfa Humid subtropical
Unnan has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 31°C, while the coldest is January averaging around −1°C at night. Precipitation is fairly even year-round, totalling about 1953 mm.
☀️
Summers
Hot
Highs near 31°C in August.
❄️
Winters
Cold
Lows near −1°C in January.
🌧️
Rain
Very wet
About 1953 mm of rain a year.
Wettest in July
⛅
Sky & trend
Often grey
Overcast skies dominate much of the year.
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)Unnan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 8 | 12 | 18 | 23 | 26 | 30 | 31 | 26 | 21 | 15 | 9 |
| Avg temp (°C) | 2 | 3 | 6 | 12 | 17 | 21 | 25 | 25 | 21 | 15 | 10 | 5 |
| Avg low (°C) | −1 | −1 | 1 | 6 | 11 | 16 | 21 | 21 | 17 | 10 | 5 | 1 |
| Precipitation (mm) | 167 | 139 | 156 | 123 | 127 | 187 | 236 | 157 | 235 | 131 | 125 | 171 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 8 | 12 | 18 | 23 | 26 |
| Avg temp (°C) | 2 | 3 | 6 | 12 | 17 | 21 |
| Avg low (°C) | −1 | −1 | 1 | 6 | 11 | 16 |
| Precipitation (mm) | 167 | 139 | 156 | 123 | 127 | 187 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 26 | 21 | 15 | 9 |
| Avg temp (°C) | 25 | 25 | 21 | 15 | 10 | 5 |
| Avg low (°C) | 21 | 21 | 17 | 10 | 5 | 1 |
| Precipitation (mm) | 236 | 157 | 235 | 131 | 125 | 171 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 88 | 83 | 75 | 68 | 69 | 78 | 75 | 65 | 71 | 68 | 75 | 84 |
| Relative humidity (%) | 86 | 84 | 82 | 79 | 78 | 82 | 85 | 83 | 84 | 83 | 84 | 86 |
| Wind speed (km/h) | 12.9 | 12.7 | 12.6 | 11.9 | 10.9 | 9.2 | 10.1 | 9.5 | 10.0 | 9.9 | 10.4 | 12.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 88 | 83 | 75 | 68 | 69 | 78 |
| Relative humidity (%) | 86 | 84 | 82 | 79 | 78 | 82 |
| Wind speed (km/h) | 12.9 | 12.7 | 12.6 | 11.9 | 10.9 | 9.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 65 | 71 | 68 | 75 | 84 |
| Relative humidity (%) | 85 | 83 | 84 | 83 | 84 | 86 |
| Wind speed (km/h) | 10.1 | 9.5 | 10.0 | 9.9 | 10.4 | 12.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kakeya, about 9 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.