Okaya, Japan climate
Cfa Humid subtropical
Okaya has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 85°F, while the coldest is January averaging around 22°F at night. Precipitation totals about 51 inches a year and is strongly seasonal — July alone averages 7.6 inches while December barely receives 1.64 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)Okaya climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 41 | 50 | 61 | 71 | 76 | 83 | 85 | 76 | 65 | 55 | 44 |
| Avg temp (°F) | 30 | 32 | 39 | 50 | 60 | 67 | 74 | 75 | 68 | 56 | 45 | 35 |
| Avg low (°F) | 22 | 23 | 30 | 40 | 50 | 59 | 67 | 69 | 61 | 49 | 37 | 28 |
| Precipitation (in) | 1.7 | 2.0 | 3.5 | 3.7 | 4.4 | 6.1 | 7.6 | 5.5 | 7.0 | 5.4 | 2.7 | 1.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 41 | 50 | 61 | 71 | 76 |
| Avg temp (°F) | 30 | 32 | 39 | 50 | 60 | 67 |
| Avg low (°F) | 22 | 23 | 30 | 40 | 50 | 59 |
| Precipitation (in) | 1.7 | 2.0 | 3.5 | 3.7 | 4.4 | 6.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 83 | 85 | 76 | 65 | 55 | 44 |
| Avg temp (°F) | 74 | 75 | 68 | 56 | 45 | 35 |
| Avg low (°F) | 67 | 69 | 61 | 49 | 37 | 28 |
| Precipitation (in) | 7.6 | 5.5 | 7.0 | 5.4 | 2.7 | 1.6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 64 | 65 | 65 | 69 | 81 | 79 | 70 | 75 | 70 | 62 | 61 |
| Relative humidity (%) | 88 | 85 | 80 | 76 | 75 | 80 | 83 | 82 | 84 | 85 | 85 | 86 |
| Wind speed (mph) | 5.6 | 5.8 | 5.7 | 5.3 | 4.4 | 3.6 | 3.7 | 3.2 | 3.4 | 3.6 | 4.3 | 5.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 64 | 65 | 65 | 69 | 81 |
| Relative humidity (%) | 88 | 85 | 80 | 76 | 75 | 80 |
| Wind speed (mph) | 5.6 | 5.8 | 5.7 | 5.3 | 4.4 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 70 | 75 | 70 | 62 | 61 |
| Relative humidity (%) | 83 | 82 | 84 | 85 | 85 | 86 |
| Wind speed (mph) | 3.7 | 3.2 | 3.4 | 3.6 | 4.3 | 5.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Suwa, about 6 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.