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Muroran, Japan climate
Cfb Oceanic / temperate
Muroran has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 24°C, while the coldest is January averaging around −4°C at night. Precipitation totals about 1189 mm a year and is strongly seasonal — August alone averages 187 mm while February barely receives 44 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)Muroran climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 1 | 5 | 10 | 15 | 18 | 22 | 24 | 22 | 16 | 9 | 3 |
| Avg temp (°C) | −2 | −2 | 1 | 6 | 11 | 14 | 19 | 21 | 18 | 13 | 6 | 1 |
| Avg low (°C) | −4 | −4 | −1 | 3 | 8 | 12 | 16 | 19 | 16 | 10 | 4 | −2 |
| Precipitation (mm) | 54 | 44 | 50 | 70 | 108 | 109 | 159 | 187 | 157 | 102 | 83 | 66 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 1 | 5 | 10 | 15 | 18 |
| Avg temp (°C) | −2 | −2 | 1 | 6 | 11 | 14 |
| Avg low (°C) | −4 | −4 | −1 | 3 | 8 | 12 |
| Precipitation (mm) | 54 | 44 | 50 | 70 | 108 | 109 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 22 | 24 | 22 | 16 | 9 | 3 |
| Avg temp (°C) | 19 | 21 | 18 | 13 | 6 | 1 |
| Avg low (°C) | 16 | 19 | 16 | 10 | 4 | −2 |
| Precipitation (mm) | 159 | 187 | 157 | 102 | 83 | 66 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 86 | 77 | 69 | 70 | 73 | 77 | 73 | 71 | 73 | 83 | 89 |
| Relative humidity (%) | 89 | 86 | 84 | 83 | 85 | 87 | 90 | 88 | 84 | 80 | 83 | 88 |
| Wind speed (km/h) | 15.0 | 15.2 | 13.5 | 10.1 | 7.7 | 6.6 | 6.6 | 7.3 | 9.4 | 11.2 | 13.0 | 14.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 90 | 86 | 77 | 69 | 70 | 73 |
| Relative humidity (%) | 89 | 86 | 84 | 83 | 85 | 87 |
| Wind speed (km/h) | 15.0 | 15.2 | 13.5 | 10.1 | 7.7 | 6.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 73 | 71 | 73 | 83 | 89 |
| Relative humidity (%) | 90 | 88 | 84 | 80 | 83 | 88 |
| Wind speed (km/h) | 6.6 | 7.3 | 9.4 | 11.2 | 13.0 | 14.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Muroran, about 1 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.