Ōkawa, Japan climate
Cfa Humid subtropical
Ōkawa has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 91°F, while the coldest is January averaging around 35°F at night. Precipitation totals about 77 inches a year and is strongly seasonal — July alone averages 14.4 inches while January barely receives 2.13 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)Ōkawa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 53 | 59 | 69 | 78 | 82 | 89 | 91 | 85 | 76 | 65 | 54 |
| Avg temp (°F) | 42 | 45 | 51 | 60 | 68 | 74 | 81 | 83 | 76 | 66 | 56 | 46 |
| Avg low (°F) | 35 | 37 | 42 | 50 | 59 | 68 | 75 | 76 | 69 | 58 | 48 | 38 |
| Precipitation (in) | 2.1 | 3.1 | 4.7 | 6.4 | 7.2 | 12.9 | 14.4 | 9.9 | 6.7 | 3.5 | 3.5 | 2.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 53 | 59 | 69 | 78 | 82 |
| Avg temp (°F) | 42 | 45 | 51 | 60 | 68 | 74 |
| Avg low (°F) | 35 | 37 | 42 | 50 | 59 | 68 |
| Precipitation (in) | 2.1 | 3.1 | 4.7 | 6.4 | 7.2 | 12.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 89 | 91 | 85 | 76 | 65 | 54 |
| Avg temp (°F) | 81 | 83 | 76 | 66 | 56 | 46 |
| Avg low (°F) | 75 | 76 | 69 | 58 | 48 | 38 |
| Precipitation (in) | 14.4 | 9.9 | 6.7 | 3.5 | 3.5 | 2.3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 70 | 67 | 68 | 81 | 73 | 66 | 67 | 60 | 65 | 71 |
| Relative humidity (%) | 75 | 74 | 74 | 76 | 79 | 85 | 86 | 83 | 81 | 76 | 74 | 75 |
| Wind speed (mph) | 9.1 | 8.8 | 8.5 | 7.3 | 6.1 | 5.6 | 5.8 | 6.1 | 7.4 | 7.9 | 7.8 | 8.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 73 | 70 | 67 | 68 | 81 |
| Relative humidity (%) | 75 | 74 | 74 | 76 | 79 | 85 |
| Wind speed (mph) | 9.1 | 8.8 | 8.5 | 7.3 | 6.1 | 5.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 73 | 66 | 67 | 60 | 65 | 71 |
| Relative humidity (%) | 86 | 83 | 81 | 76 | 74 | 75 |
| Wind speed (mph) | 5.8 | 6.1 | 7.4 | 7.9 | 7.8 | 8.8 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Saga, about 9 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.