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Itoman, Japan climate
Cfa Humid subtropical
Itoman has a mildly seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 89°F, while the coldest is January averaging around 59°F at night. Around 73 inches of precipitation falls each year, peaking in June (11.5 inches) and easing off in January (3.1 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)Itoman climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 70 | 72 | 76 | 81 | 85 | 89 | 90 | 88 | 84 | 78 | 71 |
| Avg temp (°F) | 64 | 65 | 67 | 71 | 76 | 81 | 85 | 85 | 83 | 79 | 73 | 67 |
| Avg low (°F) | 59 | 60 | 62 | 67 | 72 | 78 | 81 | 81 | 79 | 75 | 70 | 63 |
| Precipitation (in) | 3.1 | 3.7 | 4.2 | 5.3 | 8.7 | 11.5 | 5.9 | 9.0 | 7.0 | 6.4 | 4.3 | 3.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 70 | 72 | 76 | 81 | 85 |
| Avg temp (°F) | 64 | 65 | 67 | 71 | 76 | 81 |
| Avg low (°F) | 59 | 60 | 62 | 67 | 72 | 78 |
| Precipitation (in) | 3.1 | 3.7 | 4.2 | 5.3 | 8.7 | 11.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 89 | 90 | 88 | 84 | 78 | 71 |
| Avg temp (°F) | 85 | 85 | 83 | 79 | 73 | 67 |
| Avg low (°F) | 81 | 81 | 79 | 75 | 70 | 63 |
| Precipitation (in) | 5.9 | 9.0 | 7.0 | 6.4 | 4.3 | 3.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 84 | 82 | 81 | 81 | 78 | 75 | 57 | 56 | 60 | 65 | 75 | 81 |
| Relative humidity (%) | 75 | 77 | 78 | 81 | 84 | 88 | 83 | 82 | 80 | 78 | 76 | 75 |
| Wind speed (mph) | 14.2 | 13.6 | 12.8 | 11.8 | 10.5 | 11.4 | 11.4 | 11.6 | 12.1 | 13.8 | 14.2 | 14.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 84 | 82 | 81 | 81 | 78 | 75 |
| Relative humidity (%) | 75 | 77 | 78 | 81 | 84 | 88 |
| Wind speed (mph) | 14.2 | 13.6 | 12.8 | 11.8 | 10.5 | 11.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 56 | 60 | 65 | 75 | 81 |
| Relative humidity (%) | 83 | 82 | 80 | 78 | 76 | 75 |
| Wind speed (mph) | 11.4 | 11.6 | 12.1 | 13.8 | 14.2 | 14.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Ashimine, about 8 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.