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 83°F, while the coldest is January averaging around 27°F at night. Precipitation totals about 52 inches a year and is strongly seasonal — September alone averages 7.8 inches while February barely receives 1.44 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)Date climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 41 | 43 | 50 | 61 | 70 | 74 | 80 | 83 | 77 | 67 | 57 | 47 |
| Avg temp (°F) | 34 | 35 | 40 | 50 | 60 | 66 | 73 | 75 | 68 | 58 | 47 | 38 |
| Avg low (°F) | 27 | 27 | 31 | 40 | 51 | 59 | 66 | 68 | 61 | 50 | 38 | 31 |
| Precipitation (in) | 2.0 | 1.4 | 2.8 | 3.8 | 3.9 | 5.8 | 7.4 | 7.3 | 7.8 | 5.8 | 2.4 | 2.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 41 | 43 | 50 | 61 | 70 | 74 |
| Avg temp (°F) | 34 | 35 | 40 | 50 | 60 | 66 |
| Avg low (°F) | 27 | 27 | 31 | 40 | 51 | 59 |
| Precipitation (in) | 2.0 | 1.4 | 2.8 | 3.8 | 3.9 | 5.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 83 | 77 | 67 | 57 | 47 |
| Avg temp (°F) | 73 | 75 | 68 | 58 | 47 | 38 |
| Avg low (°F) | 66 | 68 | 61 | 50 | 38 | 31 |
| Precipitation (in) | 7.4 | 7.3 | 7.8 | 5.8 | 2.4 | 2.0 |
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 (mph) | 6.7 | 7.1 | 7.0 | 6.2 | 5.1 | 4.2 | 3.8 | 3.9 | 4.3 | 4.7 | 5.0 | 6.0 |
| 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 (mph) | 6.7 | 7.1 | 7.0 | 6.2 | 5.1 | 4.2 |
| 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 (mph) | 3.8 | 3.9 | 4.3 | 4.7 | 5.0 | 6.0 |
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.