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 32°C, while the coldest is January averaging around 3°C at night. Precipitation totals about 2222 mm a year and is strongly seasonal — June alone averages 464 mm while January barely receives 71 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)Izumi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 16 | 21 | 25 | 27 | 31 | 32 | 29 | 24 | 19 | 13 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 20 | 23 | 27 | 27 | 24 | 19 | 14 | 9 |
| Avg low (°C) | 3 | 3 | 6 | 10 | 15 | 19 | 23 | 24 | 21 | 15 | 10 | 5 |
| Precipitation (mm) | 71 | 95 | 130 | 143 | 187 | 464 | 411 | 233 | 212 | 98 | 99 | 80 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 12 | 16 | 21 | 25 | 27 |
| Avg temp (°C) | 7 | 8 | 11 | 15 | 20 | 23 |
| Avg low (°C) | 3 | 3 | 6 | 10 | 15 | 19 |
| Precipitation (mm) | 71 | 95 | 130 | 143 | 187 | 464 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 32 | 29 | 24 | 19 | 13 |
| Avg temp (°C) | 27 | 27 | 24 | 19 | 14 | 9 |
| Avg low (°C) | 23 | 24 | 21 | 15 | 10 | 5 |
| Precipitation (mm) | 411 | 233 | 212 | 98 | 99 | 80 |
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.