Kōshi, Japan climate
Cfa Humid subtropical
Kōshi has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 33°C, while the coldest is January averaging around −1°C at night. Precipitation totals about 1915 mm a year and is strongly seasonal — June alone averages 401 mm while January barely receives 55 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)Kōshi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 12 | 16 | 21 | 26 | 28 | 31 | 33 | 30 | 25 | 18 | 12 |
| Avg temp (°C) | 4 | 6 | 10 | 15 | 20 | 23 | 27 | 27 | 24 | 18 | 12 | 6 |
| Avg low (°C) | −1 | 0 | 3 | 8 | 14 | 19 | 23 | 23 | 19 | 12 | 6 | 1 |
| Precipitation (mm) | 55 | 80 | 123 | 140 | 158 | 401 | 381 | 182 | 169 | 82 | 84 | 61 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 12 | 16 | 21 | 26 | 28 |
| Avg temp (°C) | 4 | 6 | 10 | 15 | 20 | 23 |
| Avg low (°C) | −1 | 0 | 3 | 8 | 14 | 19 |
| Precipitation (mm) | 55 | 80 | 123 | 140 | 158 | 401 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 33 | 30 | 25 | 18 | 12 |
| Avg temp (°C) | 27 | 27 | 24 | 18 | 12 | 6 |
| Avg low (°C) | 23 | 23 | 19 | 12 | 6 | 1 |
| Precipitation (mm) | 381 | 182 | 169 | 82 | 84 | 61 |
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 (%) | 81 | 79 | 78 | 78 | 79 | 84 | 86 | 84 | 84 | 82 | 81 | 81 |
| Wind speed (km/h) | 5.5 | 5.6 | 5.4 | 4.6 | 3.9 | 3.6 | 3.7 | 3.6 | 4.1 | 4.5 | 4.6 | 5.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 |
| Relative humidity (%) | 81 | 79 | 78 | 78 | 79 | 84 |
| Wind speed (km/h) | 5.5 | 5.6 | 5.4 | 4.6 | 3.9 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 86 | 84 | 84 | 82 | 81 | 81 |
| Wind speed (km/h) | 3.7 | 3.6 | 4.1 | 4.5 | 4.6 | 5.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kikuchi, about 6 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.