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Yachimata, Japan climate
Cfa Humid subtropical
Yachimata 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 2°C at night. Around 1455 mm of precipitation falls each year, peaking in October (226 mm) and easing off in December (57 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)Yachimata climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 11 | 14 | 19 | 23 | 26 | 29 | 31 | 28 | 22 | 17 | 13 |
| Avg temp (°C) | 6 | 7 | 10 | 15 | 19 | 22 | 26 | 27 | 24 | 19 | 13 | 9 |
| Avg low (°C) | 2 | 3 | 6 | 11 | 15 | 19 | 23 | 24 | 21 | 16 | 10 | 5 |
| Precipitation (mm) | 67 | 59 | 111 | 110 | 122 | 151 | 136 | 116 | 205 | 226 | 94 | 57 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 11 | 14 | 19 | 23 | 26 |
| Avg temp (°C) | 6 | 7 | 10 | 15 | 19 | 22 |
| Avg low (°C) | 2 | 3 | 6 | 11 | 15 | 19 |
| Precipitation (mm) | 67 | 59 | 111 | 110 | 122 | 151 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 31 | 28 | 22 | 17 | 13 |
| Avg temp (°C) | 26 | 27 | 24 | 19 | 13 | 9 |
| Avg low (°C) | 23 | 24 | 21 | 16 | 10 | 5 |
| Precipitation (mm) | 136 | 116 | 205 | 226 | 94 | 57 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 65 | 70 | 69 | 72 | 81 | 74 | 60 | 71 | 72 | 68 | 62 |
| Relative humidity (%) | 75 | 74 | 75 | 77 | 79 | 82 | 83 | 81 | 82 | 82 | 80 | 77 |
| Wind speed (km/h) | 9.6 | 10.4 | 10.8 | 10.5 | 9.5 | 8.4 | 8.7 | 8.3 | 8.9 | 9.0 | 8.4 | 8.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 65 | 70 | 69 | 72 | 81 |
| Relative humidity (%) | 75 | 74 | 75 | 77 | 79 | 82 |
| Wind speed (km/h) | 9.6 | 10.4 | 10.8 | 10.5 | 9.5 | 8.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 60 | 71 | 72 | 68 | 62 |
| Relative humidity (%) | 83 | 81 | 82 | 82 | 80 | 77 |
| Wind speed (km/h) | 8.7 | 8.3 | 8.9 | 9.0 | 8.4 | 8.9 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Chiba, about 20 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.