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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 87°F, while the coldest is January averaging around 32°F at night. Around 76 inches of precipitation falls each year, peaking in July (10.8 inches) and easing off in May (3.6 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)Nagaoka climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 42 | 44 | 51 | 61 | 70 | 77 | 83 | 87 | 80 | 69 | 58 | 47 |
| Avg temp (°F) | 37 | 37 | 43 | 51 | 61 | 69 | 75 | 79 | 71 | 61 | 50 | 41 |
| Avg low (°F) | 32 | 31 | 35 | 43 | 53 | 62 | 70 | 73 | 65 | 54 | 44 | 35 |
| Precipitation (in) | 7.2 | 4.4 | 4.5 | 4.1 | 3.6 | 5.0 | 10.8 | 5.9 | 6.3 | 6.1 | 8.6 | 9.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 42 | 44 | 51 | 61 | 70 | 77 |
| Avg temp (°F) | 37 | 37 | 43 | 51 | 61 | 69 |
| Avg low (°F) | 32 | 31 | 35 | 43 | 53 | 62 |
| Precipitation (in) | 7.2 | 4.4 | 4.5 | 4.1 | 3.6 | 5.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 87 | 80 | 69 | 58 | 47 |
| Avg temp (°F) | 75 | 79 | 71 | 61 | 50 | 41 |
| Avg low (°F) | 70 | 73 | 65 | 54 | 44 | 35 |
| Precipitation (in) | 10.8 | 5.9 | 6.3 | 6.1 | 8.6 | 9.7 |
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 (%) | 86 | 83 | 79 | 77 | 78 | 80 | 83 | 80 | 80 | 80 | 82 | 85 |
| Wind speed (mph) | 7.0 | 7.5 | 6.0 | 4.3 | 3.0 | 2.6 | 2.5 | 2.8 | 3.4 | 3.9 | 4.6 | 5.9 |
| 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 (mph) | 7.0 | 7.5 | 6.0 | 4.3 | 3.0 | 2.6 |
| 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 (mph) | 2.5 | 2.8 | 3.4 | 3.9 | 4.6 | 5.9 |
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.