Oyama, Japan climate
Cfa Humid subtropical
Oyama has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 31°C, while the coldest is January averaging around −3°C at night. Precipitation totals about 1208 mm a year and is strongly seasonal — October alone averages 184 mm while February barely receives 38 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)Oyama climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 19 | 23 | 26 | 30 | 31 | 28 | 22 | 16 | 11 |
| Avg temp (°C) | 3 | 4 | 8 | 13 | 18 | 21 | 25 | 26 | 22 | 17 | 11 | 5 |
| Avg low (°C) | −3 | −2 | 2 | 7 | 13 | 17 | 21 | 22 | 19 | 12 | 5 | −1 |
| Precipitation (mm) | 40 | 38 | 75 | 106 | 117 | 114 | 144 | 122 | 150 | 184 | 69 | 48 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 19 | 23 | 26 |
| Avg temp (°C) | 3 | 4 | 8 | 13 | 18 | 21 |
| Avg low (°C) | −3 | −2 | 2 | 7 | 13 | 17 |
| Precipitation (mm) | 40 | 38 | 75 | 106 | 117 | 114 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 28 | 22 | 16 | 11 |
| Avg temp (°C) | 25 | 26 | 22 | 17 | 11 | 5 |
| Avg low (°C) | 21 | 22 | 19 | 12 | 5 | −1 |
| Precipitation (mm) | 144 | 122 | 150 | 184 | 69 | 48 |
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 (%) | 77 | 76 | 75 | 76 | 77 | 81 | 83 | 82 | 84 | 83 | 81 | 79 |
| Wind speed (mph) | 3.0 | 3.3 | 3.5 | 3.6 | 3.1 | 2.8 | 2.6 | 2.5 | 2.7 | 2.6 | 2.5 | 2.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 55 | 60 | 65 | 71 | 82 |
| Relative humidity (%) | 77 | 76 | 75 | 76 | 77 | 81 |
| Wind speed (mph) | 3.0 | 3.3 | 3.5 | 3.6 | 3.1 | 2.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 72 | 75 | 68 | 55 | 49 |
| Relative humidity (%) | 83 | 82 | 84 | 83 | 81 | 79 |
| Wind speed (mph) | 2.6 | 2.5 | 2.7 | 2.6 | 2.5 | 2.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Shimodate, about 17 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.