Gero, Japan climate
Cfa Humid subtropical
Gero has a seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 31°C, while the coldest is January averaging around −4°C at night. Precipitation totals about 2440 mm a year and is strongly seasonal — July alone averages 400 mm while January barely receives 80 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)Gero climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 7 | 12 | 18 | 23 | 26 | 29 | 31 | 27 | 21 | 14 | 8 |
| Avg temp (°C) | 0 | 1 | 5 | 11 | 16 | 20 | 24 | 25 | 21 | 15 | 8 | 3 |
| Avg low (°C) | −4 | −4 | −1 | 4 | 10 | 15 | 20 | 20 | 16 | 10 | 3 | −2 |
| Precipitation (mm) | 80 | 96 | 166 | 187 | 199 | 274 | 400 | 321 | 302 | 184 | 131 | 100 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 7 | 12 | 18 | 23 | 26 |
| Avg temp (°C) | 0 | 1 | 5 | 11 | 16 | 20 |
| Avg low (°C) | −4 | −4 | −1 | 4 | 10 | 15 |
| Precipitation (mm) | 80 | 96 | 166 | 187 | 199 | 274 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 31 | 27 | 21 | 14 | 8 |
| Avg temp (°C) | 24 | 25 | 21 | 15 | 8 | 3 |
| Avg low (°C) | 20 | 20 | 16 | 10 | 3 | −2 |
| Precipitation (mm) | 400 | 321 | 302 | 184 | 131 | 100 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 58 | 62 | 64 | 69 | 81 | 77 | 68 | 71 | 63 | 57 | 57 |
| Relative humidity (%) | 95 | 92 | 87 | 81 | 80 | 84 | 87 | 86 | 87 | 87 | 89 | 93 |
| Wind speed (km/h) | 7.9 | 8.0 | 7.8 | 7.3 | 6.1 | 4.9 | 5.2 | 4.4 | 4.7 | 5.1 | 5.9 | 7.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 58 | 58 | 62 | 64 | 69 | 81 |
| Relative humidity (%) | 95 | 92 | 87 | 81 | 80 | 84 |
| Wind speed (km/h) | 7.9 | 8.0 | 7.8 | 7.3 | 6.1 | 4.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 68 | 71 | 63 | 57 | 57 |
| Relative humidity (%) | 87 | 86 | 87 | 87 | 89 | 93 |
| Wind speed (km/h) | 5.2 | 4.4 | 4.7 | 5.1 | 5.9 | 7.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Miyaji, 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.