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Itoigawa, Japan climate
Cfa Humid subtropical
Itoigawa has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 30°C, while the coldest is January averaging around 1°C at night. Around 2902 mm of precipitation falls each year, peaking in December (407 mm) and easing off in May (120 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)Itoigawa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 7 | 11 | 16 | 21 | 24 | 29 | 30 | 27 | 21 | 16 | 10 |
| Avg temp (°C) | 4 | 4 | 7 | 12 | 17 | 21 | 25 | 27 | 23 | 17 | 12 | 7 |
| Avg low (°C) | 1 | 1 | 3 | 8 | 13 | 18 | 22 | 24 | 20 | 14 | 8 | 3 |
| Precipitation (mm) | 355 | 226 | 204 | 135 | 120 | 168 | 238 | 223 | 251 | 232 | 341 | 407 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 7 | 7 | 11 | 16 | 21 | 24 |
| Avg temp (°C) | 4 | 4 | 7 | 12 | 17 | 21 |
| Avg low (°C) | 1 | 1 | 3 | 8 | 13 | 18 |
| Precipitation (mm) | 355 | 226 | 204 | 135 | 120 | 168 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 27 | 21 | 16 | 10 |
| Avg temp (°C) | 25 | 27 | 23 | 17 | 12 | 7 |
| Avg low (°C) | 22 | 24 | 20 | 14 | 8 | 3 |
| Precipitation (mm) | 238 | 223 | 251 | 232 | 341 | 407 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 91 | 85 | 76 | 68 | 68 | 75 | 75 | 63 | 71 | 69 | 76 | 87 |
| 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 (%) | 91 | 85 | 76 | 68 | 68 | 75 |
| 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 (%) | 75 | 63 | 71 | 69 | 76 | 87 |
| 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 Itoigawa, about 2 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.