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Tomioka, Japan climate
Cfa Humid subtropical
Tomioka has a seasonal mild-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 −3°C at night. Precipitation totals about 1355 mm a year and is strongly seasonal — August alone averages 222 mm while December barely receives 24 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)Tomioka climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 19 | 24 | 27 | 30 | 31 | 27 | 22 | 17 | 12 |
| Avg temp (°C) | 3 | 4 | 7 | 13 | 18 | 21 | 25 | 26 | 22 | 16 | 10 | 5 |
| Avg low (°C) | −3 | −2 | 1 | 6 | 12 | 17 | 21 | 22 | 18 | 12 | 5 | 0 |
| Precipitation (mm) | 29 | 27 | 61 | 79 | 112 | 173 | 221 | 222 | 214 | 148 | 45 | 24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 19 | 24 | 27 |
| Avg temp (°C) | 3 | 4 | 7 | 13 | 18 | 21 |
| Avg low (°C) | −3 | −2 | 1 | 6 | 12 | 17 |
| Precipitation (mm) | 29 | 27 | 61 | 79 | 112 | 173 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 31 | 27 | 22 | 17 | 12 |
| Avg temp (°C) | 25 | 26 | 22 | 16 | 10 | 5 |
| Avg low (°C) | 21 | 22 | 18 | 12 | 5 | 0 |
| Precipitation (mm) | 221 | 222 | 214 | 148 | 45 | 24 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 64 | 65 | 65 | 69 | 81 | 79 | 70 | 75 | 70 | 62 | 61 |
| Relative humidity (%) | 93 | 92 | 86 | 81 | 80 | 84 | 86 | 86 | 88 | 88 | 89 | 91 |
| Wind speed (mph) | 6.1 | 6.4 | 6.1 | 5.2 | 4.2 | 3.2 | 2.9 | 2.9 | 3.4 | 3.7 | 4.1 | 5.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 64 | 65 | 65 | 69 | 81 |
| Relative humidity (%) | 93 | 92 | 86 | 81 | 80 | 84 |
| Wind speed (mph) | 6.1 | 6.4 | 6.1 | 5.2 | 4.2 | 3.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 70 | 75 | 70 | 62 | 61 |
| Relative humidity (%) | 86 | 86 | 88 | 88 | 89 | 91 |
| Wind speed (mph) | 2.9 | 2.9 | 3.4 | 3.7 | 4.1 | 5.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kamisatomi, 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.