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Okegawa, Japan climate
Cfa Humid subtropical
Okegawa has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 89°F, while the coldest is January averaging around 29°F at night. Precipitation totals about 52 inches a year and is strongly seasonal — September alone averages 7.8 inches while February barely receives 1.52 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)Okegawa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 51 | 57 | 67 | 75 | 80 | 87 | 89 | 82 | 71 | 62 | 53 |
| Avg temp (°F) | 38 | 40 | 47 | 56 | 65 | 71 | 78 | 80 | 73 | 63 | 52 | 42 |
| Avg low (°F) | 29 | 31 | 37 | 46 | 56 | 64 | 71 | 73 | 67 | 55 | 43 | 33 |
| Precipitation (in) | 1.7 | 1.5 | 3.2 | 3.9 | 4.9 | 5.6 | 5.8 | 5.8 | 7.8 | 7.5 | 2.6 | 1.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 51 | 57 | 67 | 75 | 80 |
| Avg temp (°F) | 38 | 40 | 47 | 56 | 65 | 71 |
| Avg low (°F) | 29 | 31 | 37 | 46 | 56 | 64 |
| Precipitation (in) | 1.7 | 1.5 | 3.2 | 3.9 | 4.9 | 5.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 87 | 89 | 82 | 71 | 62 | 53 |
| Avg temp (°F) | 78 | 80 | 73 | 63 | 52 | 42 |
| Avg low (°F) | 71 | 73 | 67 | 55 | 43 | 33 |
| Precipitation (in) | 5.8 | 5.8 | 7.8 | 7.5 | 2.6 | 1.6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 55 | 60 | 65 | 71 | 82 | 81 | 72 | 75 | 68 | 55 | 49 |
| Relative humidity (%) | 76 | 75 | 74 | 74 | 76 | 80 | 81 | 81 | 83 | 82 | 80 | 78 |
| Wind speed (mph) | 4.6 | 5.1 | 5.2 | 5.3 | 4.8 | 4.3 | 4.1 | 4.0 | 4.2 | 3.9 | 3.7 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 55 | 60 | 65 | 71 | 82 |
| Relative humidity (%) | 76 | 75 | 74 | 74 | 76 | 80 |
| Wind speed (mph) | 4.6 | 5.1 | 5.2 | 5.3 | 4.8 | 4.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 72 | 75 | 68 | 55 | 49 |
| Relative humidity (%) | 81 | 81 | 83 | 82 | 80 | 78 |
| Wind speed (mph) | 4.1 | 4.0 | 4.2 | 3.9 | 3.7 | 4.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kuki, about 12 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.