Ōi, Japan climate
Cfa Humid subtropical
Ōi has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 32°C, while the coldest is January averaging around −1°C at night. Precipitation totals about 1366 mm a year and is strongly seasonal — September alone averages 203 mm while February barely receives 40 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)Ōi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 19 | 24 | 27 | 31 | 32 | 28 | 22 | 17 | 12 |
| Avg temp (°C) | 4 | 5 | 8 | 14 | 19 | 22 | 26 | 27 | 23 | 18 | 11 | 6 |
| Avg low (°C) | −1 | 0 | 3 | 8 | 14 | 18 | 22 | 23 | 20 | 14 | 7 | 1 |
| Precipitation (mm) | 42 | 40 | 88 | 102 | 121 | 145 | 148 | 164 | 203 | 197 | 71 | 45 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 19 | 24 | 27 |
| Avg temp (°C) | 4 | 5 | 8 | 14 | 19 | 22 |
| Avg low (°C) | −1 | 0 | 3 | 8 | 14 | 18 |
| Precipitation (mm) | 42 | 40 | 88 | 102 | 121 | 145 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 32 | 28 | 22 | 17 | 12 |
| Avg temp (°C) | 26 | 27 | 23 | 18 | 11 | 6 |
| Avg low (°C) | 22 | 23 | 20 | 14 | 7 | 1 |
| Precipitation (mm) | 148 | 164 | 203 | 197 | 71 | 45 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 52 | 60 | 64 | 70 | 82 | 75 | 64 | 71 | 67 | 56 | 45 |
| Relative humidity (%) | 76 | 75 | 74 | 74 | 76 | 80 | 81 | 81 | 83 | 82 | 80 | 78 |
| Wind speed (km/h) | 7.5 | 8.2 | 8.4 | 8.5 | 7.7 | 6.8 | 6.7 | 6.4 | 6.8 | 6.3 | 6.0 | 6.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 52 | 60 | 64 | 70 | 82 |
| Relative humidity (%) | 76 | 75 | 74 | 74 | 76 | 80 |
| Wind speed (km/h) | 7.5 | 8.2 | 8.4 | 8.5 | 7.7 | 6.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 64 | 71 | 67 | 56 | 45 |
| Relative humidity (%) | 81 | 81 | 83 | 82 | 80 | 78 |
| Wind speed (km/h) | 6.7 | 6.4 | 6.8 | 6.3 | 6.0 | 6.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Saitama, about 7 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.