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Jōetsu, Japan climate
Cfa Humid subtropical
Jōetsu 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 0°C at night. Precipitation totals about 2837 mm a year and is strongly seasonal — December alone averages 475 mm while May barely receives 87 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)Jōetsu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 18 | 23 | 26 | 30 | 31 | 27 | 22 | 16 | 9 |
| Avg temp (°C) | 3 | 3 | 6 | 12 | 17 | 21 | 25 | 26 | 22 | 16 | 11 | 5 |
| Avg low (°C) | 0 | −1 | 1 | 6 | 12 | 17 | 22 | 23 | 18 | 12 | 6 | 2 |
| Precipitation (mm) | 430 | 263 | 195 | 105 | 87 | 136 | 207 | 185 | 206 | 214 | 334 | 475 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 18 | 23 | 26 |
| Avg temp (°C) | 3 | 3 | 6 | 12 | 17 | 21 |
| Avg low (°C) | 0 | −1 | 1 | 6 | 12 | 17 |
| Precipitation (mm) | 430 | 263 | 195 | 105 | 87 | 136 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 27 | 22 | 16 | 9 |
| Avg temp (°C) | 25 | 26 | 22 | 16 | 11 | 5 |
| Avg low (°C) | 22 | 23 | 18 | 12 | 6 | 2 |
| Precipitation (mm) | 207 | 185 | 206 | 214 | 334 | 475 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 85 | 78 | 69 | 68 | 76 | 77 | 66 | 73 | 71 | 76 | 86 |
| Relative humidity (%) | 90 | 87 | 82 | 78 | 77 | 82 | 84 | 82 | 83 | 82 | 84 | 88 |
| Wind speed (m/s) | 3.8 | 3.7 | 3.2 | 2.5 | 1.9 | 1.5 | 1.5 | 1.6 | 1.9 | 2.2 | 2.7 | 3.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 85 | 78 | 69 | 68 | 76 |
| Relative humidity (%) | 90 | 87 | 82 | 78 | 77 | 82 |
| Wind speed (m/s) | 3.8 | 3.7 | 3.2 | 2.5 | 1.9 | 1.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 66 | 73 | 71 | 76 | 86 |
| Relative humidity (%) | 84 | 82 | 83 | 82 | 84 | 88 |
| Wind speed (m/s) | 1.5 | 1.6 | 1.9 | 2.2 | 2.7 | 3.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Takada, about 5 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.