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Nagaoka, Japan climate
Cfa Humid subtropical
Nagaoka 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. Around 1936 mm of precipitation falls each year, peaking in July (274 mm) and easing off in May (91 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)Nagaoka climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 16 | 21 | 25 | 28 | 31 | 27 | 21 | 15 | 9 |
| Avg temp (°C) | 3 | 3 | 6 | 11 | 16 | 20 | 24 | 26 | 22 | 16 | 10 | 5 |
| Avg low (°C) | 0 | 0 | 2 | 6 | 12 | 17 | 21 | 23 | 18 | 12 | 7 | 2 |
| Precipitation (mm) | 182 | 111 | 115 | 103 | 91 | 128 | 274 | 150 | 161 | 154 | 219 | 247 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 6 | 7 | 11 | 16 | 21 | 25 |
| Avg temp (°C) | 3 | 3 | 6 | 11 | 16 | 20 |
| Avg low (°C) | 0 | 0 | 2 | 6 | 12 | 17 |
| Precipitation (mm) | 182 | 111 | 115 | 103 | 91 | 128 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 31 | 27 | 21 | 15 | 9 |
| Avg temp (°C) | 24 | 26 | 22 | 16 | 10 | 5 |
| Avg low (°C) | 21 | 23 | 18 | 12 | 7 | 2 |
| Precipitation (mm) | 274 | 150 | 161 | 154 | 219 | 247 |
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 (%) | 86 | 83 | 79 | 77 | 78 | 80 | 83 | 80 | 80 | 80 | 82 | 85 |
| Wind speed (km/h) | 11.3 | 12.1 | 9.7 | 6.8 | 4.9 | 4.1 | 4.0 | 4.5 | 5.4 | 6.2 | 7.3 | 9.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 85 | 78 | 69 | 68 | 76 |
| Relative humidity (%) | 86 | 83 | 79 | 77 | 78 | 80 |
| Wind speed (km/h) | 11.3 | 12.1 | 9.7 | 6.8 | 4.9 | 4.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 66 | 73 | 71 | 76 | 86 |
| Relative humidity (%) | 83 | 80 | 80 | 80 | 82 | 85 |
| Wind speed (km/h) | 4.0 | 4.5 | 5.4 | 6.2 | 7.3 | 9.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Teradomari, about 22 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.