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Niigata, Japan climate
Cfa Humid subtropical
Niigata 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 1846 mm of precipitation falls each year, peaking in December (226 mm) and easing off in May (94 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)Niigata climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 6 | 10 | 16 | 21 | 25 | 29 | 31 | 26 | 21 | 14 | 9 |
| Avg temp (°C) | 3 | 3 | 6 | 11 | 17 | 21 | 25 | 27 | 23 | 17 | 11 | 5 |
| Avg low (°C) | 0 | 0 | 2 | 7 | 13 | 18 | 22 | 23 | 19 | 13 | 7 | 2 |
| Precipitation (mm) | 181 | 116 | 112 | 97 | 94 | 121 | 222 | 163 | 152 | 158 | 204 | 226 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 6 | 10 | 16 | 21 | 25 |
| Avg temp (°C) | 3 | 3 | 6 | 11 | 17 | 21 |
| Avg low (°C) | 0 | 0 | 2 | 7 | 13 | 18 |
| Precipitation (mm) | 181 | 116 | 112 | 97 | 94 | 121 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 31 | 26 | 21 | 14 | 9 |
| Avg temp (°C) | 25 | 27 | 23 | 17 | 11 | 5 |
| Avg low (°C) | 22 | 23 | 19 | 13 | 7 | 2 |
| Precipitation (mm) | 222 | 163 | 152 | 158 | 204 | 226 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 86 | 81 | 77 | 73 | 70 | 78 | 79 | 69 | 76 | 75 | 78 | 84 |
| Relative humidity (%) | 79 | 76 | 74 | 77 | 80 | 82 | 85 | 80 | 76 | 73 | 75 | 78 |
| Wind speed (m/s) | 6.2 | 5.9 | 4.9 | 3.6 | 2.7 | 2.4 | 2.3 | 2.7 | 3.4 | 4.0 | 4.8 | 5.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 86 | 81 | 77 | 73 | 70 | 78 |
| Relative humidity (%) | 79 | 76 | 74 | 77 | 80 | 82 |
| Wind speed (m/s) | 6.2 | 5.9 | 4.9 | 3.6 | 2.7 | 2.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 69 | 76 | 75 | 78 | 84 |
| Relative humidity (%) | 85 | 80 | 76 | 73 | 75 | 78 |
| Wind speed (m/s) | 2.3 | 2.7 | 3.4 | 4.0 | 4.8 | 5.9 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Niigata, about 4 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.