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Karuizawa, Japan climate
Cfb Oceanic / temperate
Karuizawa has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is August with an average daily high near 28°C, while the coldest is January averaging around −7°C at night. Precipitation totals about 1013 mm a year and is strongly seasonal — July alone averages 156 mm while December barely receives 28 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)Karuizawa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 4 | 8 | 15 | 20 | 23 | 27 | 28 | 23 | 17 | 12 | 6 |
| Avg temp (°C) | −3 | −2 | 2 | 8 | 14 | 17 | 21 | 22 | 18 | 11 | 6 | 0 |
| Avg low (°C) | −7 | −7 | −4 | 2 | 8 | 13 | 17 | 18 | 13 | 7 | 1 | −4 |
| Precipitation (mm) | 32 | 33 | 61 | 62 | 87 | 120 | 156 | 122 | 146 | 118 | 47 | 28 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 4 | 8 | 15 | 20 | 23 |
| Avg temp (°C) | −3 | −2 | 2 | 8 | 14 | 17 |
| Avg low (°C) | −7 | −7 | −4 | 2 | 8 | 13 |
| Precipitation (mm) | 32 | 33 | 61 | 62 | 87 | 120 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 28 | 23 | 17 | 12 | 6 |
| Avg temp (°C) | 21 | 22 | 18 | 11 | 6 | 0 |
| Avg low (°C) | 17 | 18 | 13 | 7 | 1 | −4 |
| Precipitation (mm) | 156 | 122 | 146 | 118 | 47 | 28 |
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 (%) | 90 | 87 | 82 | 76 | 75 | 79 | 81 | 81 | 83 | 84 | 85 | 88 |
| Wind speed (km/h) | 8.6 | 9.4 | 9.1 | 8.0 | 6.4 | 5.0 | 4.9 | 4.6 | 4.9 | 5.3 | 6.2 | 7.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 63 | 64 | 65 | 65 | 69 | 81 |
| Relative humidity (%) | 90 | 87 | 82 | 76 | 75 | 79 |
| Wind speed (km/h) | 8.6 | 9.4 | 9.1 | 8.0 | 6.4 | 5.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 70 | 75 | 70 | 62 | 61 |
| Relative humidity (%) | 81 | 81 | 83 | 84 | 85 | 88 |
| Wind speed (km/h) | 4.9 | 4.6 | 4.9 | 5.3 | 6.2 | 7.7 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Tomi, about 23 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.