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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 88°F, while the coldest is January averaging around 31°F at night. Precipitation totals about 112 inches a year and is strongly seasonal — December alone averages 18.7 inches while May barely receives 3.42 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)Jōetsu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 44 | 52 | 64 | 73 | 78 | 85 | 88 | 81 | 71 | 60 | 49 |
| Avg temp (°F) | 37 | 37 | 42 | 53 | 63 | 70 | 77 | 80 | 72 | 62 | 51 | 42 |
| Avg low (°F) | 31 | 31 | 35 | 43 | 53 | 62 | 71 | 73 | 65 | 54 | 43 | 35 |
| Precipitation (in) | 16.9 | 10.4 | 7.7 | 4.1 | 3.4 | 5.4 | 8.1 | 7.3 | 8.1 | 8.4 | 13.2 | 18.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 43 | 44 | 52 | 64 | 73 | 78 |
| Avg temp (°F) | 37 | 37 | 42 | 53 | 63 | 70 |
| Avg low (°F) | 31 | 31 | 35 | 43 | 53 | 62 |
| Precipitation (in) | 16.9 | 10.4 | 7.7 | 4.1 | 3.4 | 5.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 88 | 81 | 71 | 60 | 49 |
| Avg temp (°F) | 77 | 80 | 72 | 62 | 51 | 42 |
| Avg low (°F) | 71 | 73 | 65 | 54 | 43 | 35 |
| Precipitation (in) | 8.1 | 7.3 | 8.1 | 8.4 | 13.2 | 18.7 |
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 (mph) | 8.5 | 8.4 | 7.1 | 5.5 | 4.1 | 3.4 | 3.3 | 3.6 | 4.2 | 4.9 | 6.0 | 7.7 |
| 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 (mph) | 8.5 | 8.4 | 7.1 | 5.5 | 4.1 | 3.4 |
| 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 (mph) | 3.3 | 3.6 | 4.2 | 4.9 | 6.0 | 7.7 |
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.