Date, Japan climate
Cfa Humid subtropical
Date has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 28°C, while the coldest is January averaging around −3°C at night. Precipitation totals about 1327 mm a year and is strongly seasonal — September alone averages 197 mm while February barely receives 37 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)Date climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 6 | 10 | 16 | 21 | 24 | 27 | 28 | 25 | 20 | 14 | 8 |
| Avg temp (°C) | 1 | 2 | 5 | 10 | 16 | 19 | 23 | 24 | 20 | 15 | 9 | 4 |
| Avg low (°C) | −3 | −3 | 0 | 5 | 11 | 15 | 19 | 20 | 16 | 10 | 4 | −1 |
| Precipitation (mm) | 51 | 37 | 71 | 96 | 99 | 147 | 188 | 186 | 197 | 146 | 60 | 50 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 6 | 10 | 16 | 21 | 24 |
| Avg temp (°C) | 1 | 2 | 5 | 10 | 16 | 19 |
| Avg low (°C) | −3 | −3 | 0 | 5 | 11 | 15 |
| Precipitation (mm) | 51 | 37 | 71 | 96 | 99 | 147 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 28 | 25 | 20 | 14 | 8 |
| Avg temp (°C) | 23 | 24 | 20 | 15 | 9 | 4 |
| Avg low (°C) | 19 | 20 | 16 | 10 | 4 | −1 |
| Precipitation (mm) | 188 | 186 | 197 | 146 | 60 | 50 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 75 | 73 | 71 | 71 | 77 | 80 | 71 | 76 | 72 | 74 | 79 |
| Relative humidity (%) | 90 | 87 | 83 | 80 | 80 | 82 | 85 | 84 | 85 | 85 | 87 | 89 |
| Wind speed (km/h) | 10.7 | 11.4 | 11.2 | 10.0 | 8.2 | 6.7 | 6.1 | 6.2 | 6.9 | 7.5 | 8.0 | 9.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 75 | 73 | 71 | 71 | 77 |
| Relative humidity (%) | 90 | 87 | 83 | 80 | 80 | 82 |
| Wind speed (km/h) | 10.7 | 11.4 | 11.2 | 10.0 | 8.2 | 6.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 80 | 71 | 76 | 72 | 74 | 79 |
| Relative humidity (%) | 85 | 84 | 85 | 85 | 87 | 89 |
| Wind speed (km/h) | 6.1 | 6.2 | 6.9 | 7.5 | 8.0 | 9.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Shiroishi, about 24 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.