Izumi, Japan climate
Cfa Humid subtropical
Izumi has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 90°F, while the coldest is January averaging around 37°F at night. Precipitation totals about 87 inches a year and is strongly seasonal — June alone averages 18.3 inches while January barely receives 2.80 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)Izumi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 52 | 54 | 60 | 69 | 77 | 81 | 88 | 90 | 85 | 76 | 66 | 56 |
| Avg temp (°F) | 44 | 46 | 52 | 60 | 67 | 73 | 80 | 81 | 76 | 66 | 57 | 48 |
| Avg low (°F) | 37 | 38 | 43 | 51 | 59 | 67 | 74 | 75 | 69 | 59 | 49 | 40 |
| Precipitation (in) | 2.8 | 3.7 | 5.1 | 5.6 | 7.4 | 18.3 | 16.2 | 9.2 | 8.4 | 3.8 | 3.9 | 3.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 52 | 54 | 60 | 69 | 77 | 81 |
| Avg temp (°F) | 44 | 46 | 52 | 60 | 67 | 73 |
| Avg low (°F) | 37 | 38 | 43 | 51 | 59 | 67 |
| Precipitation (in) | 2.8 | 3.7 | 5.1 | 5.6 | 7.4 | 18.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 90 | 85 | 76 | 66 | 56 |
| Avg temp (°F) | 80 | 81 | 76 | 66 | 57 | 48 |
| Avg low (°F) | 74 | 75 | 69 | 59 | 49 | 40 |
| Precipitation (in) | 16.2 | 9.2 | 8.4 | 3.8 | 3.9 | 3.2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 83 | 81 | 80 | 79 | 81 | 86 | 86 | 84 | 84 | 82 | 83 | 83 |
| Wind speed (mph) | 3.4 | 3.5 | 3.4 | 3.1 | 2.6 | 2.5 | 2.5 | 2.6 | 2.5 | 2.6 | 2.9 | 3.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 71 | 67 | 66 | 64 | 68 | 81 |
| Relative humidity (%) | 83 | 81 | 80 | 79 | 81 | 86 |
| Wind speed (mph) | 3.4 | 3.5 | 3.4 | 3.1 | 2.6 | 2.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 70 | 62 | 63 | 55 | 60 | 66 |
| Relative humidity (%) | 86 | 84 | 84 | 82 | 83 | 83 |
| Wind speed (mph) | 2.5 | 2.6 | 2.5 | 2.6 | 2.9 | 3.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Minamata, about 14 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.