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Karatsu, Japan climate
Cfa Humid subtropical
Karatsu 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 37°F at night. Precipitation totals about 78 inches a year and is strongly seasonal — July alone averages 13.7 inches while January barely receives 2.97 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)Karatsu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 52 | 59 | 66 | 75 | 79 | 86 | 89 | 81 | 73 | 64 | 54 |
| Avg temp (°F) | 43 | 45 | 51 | 58 | 66 | 72 | 80 | 82 | 75 | 66 | 56 | 47 |
| Avg low (°F) | 37 | 38 | 43 | 50 | 58 | 67 | 74 | 76 | 69 | 60 | 49 | 40 |
| Precipitation (in) | 3.0 | 3.4 | 4.6 | 5.8 | 4.9 | 11.0 | 13.7 | 12.4 | 7.5 | 5.0 | 3.4 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 52 | 59 | 66 | 75 | 79 |
| Avg temp (°F) | 43 | 45 | 51 | 58 | 66 | 72 |
| Avg low (°F) | 37 | 38 | 43 | 50 | 58 | 67 |
| Precipitation (in) | 3.0 | 3.4 | 4.6 | 5.8 | 4.9 | 11.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 86 | 89 | 81 | 73 | 64 | 54 |
| Avg temp (°F) | 80 | 82 | 75 | 66 | 56 | 47 |
| Avg low (°F) | 74 | 76 | 69 | 60 | 49 | 40 |
| Precipitation (in) | 13.7 | 12.4 | 7.5 | 5.0 | 3.4 | 3.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 75 | 74 | 72 | 72 | 82 | 72 | 65 | 68 | 64 | 69 | 74 |
| 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 (%) | 79 | 75 | 74 | 72 | 72 | 82 |
| 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 (%) | 72 | 65 | 68 | 64 | 69 | 74 |
| 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 Karatsu, about 2 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.