Ōtsu, Japan climate
Cfa Humid subtropical
Ōtsu has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 34°C, while the coldest is January averaging around 2°C at night. Precipitation totals about 1523 mm a year and is strongly seasonal — July alone averages 224 mm while January barely receives 53 mm. Snow is occasional (15 cm of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 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)Ōtsu climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 20 | 25 | 28 | 32 | 34 | 29 | 23 | 17 | 12 |
| Avg temp (°C) | 5 | 5 | 9 | 14 | 20 | 23 | 27 | 29 | 24 | 18 | 13 | 7 |
| Avg low (°C) | 2 | 2 | 4 | 9 | 15 | 19 | 24 | 25 | 21 | 14 | 8 | 4 |
| Precipitation (mm) | 53 | 65 | 106 | 117 | 151 | 200 | 224 | 154 | 179 | 143 | 74 | 57 |
| Snowfall (cm) | 5 | 7 | 1 | — | — | — | — | — | — | — | — | 2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 9 | 10 | 14 | 20 | 25 | 28 |
| Avg temp (°C) | 5 | 5 | 9 | 14 | 20 | 23 |
| Avg low (°C) | 2 | 2 | 4 | 9 | 15 | 19 |
| Precipitation (mm) | 53 | 65 | 106 | 117 | 151 | 200 |
| Snowfall (cm) | 5 | 7 | 1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 34 | 29 | 23 | 17 | 12 |
| Avg temp (°C) | 27 | 29 | 24 | 18 | 13 | 7 |
| Avg low (°C) | 24 | 25 | 21 | 14 | 8 | 4 |
| Precipitation (mm) | 224 | 154 | 179 | 143 | 74 | 57 |
| Snowfall (cm) | — | — | — | — | — | 2 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 84 | 81 | 75 | 69 | 71 | 81 | 77 | 66 | 74 | 70 | 74 | 80 |
| Relative humidity (%) | 85 | 83 | 81 | 79 | 81 | 84 | 86 | 84 | 85 | 84 | 84 | 85 |
| Wind speed (km/h) | 10.2 | 10.6 | 10.8 | 9.6 | 8.4 | 7.4 | 7.2 | 7.1 | 7.9 | 8.2 | 8.2 | 9.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 84 | 81 | 75 | 69 | 71 | 81 |
| Relative humidity (%) | 85 | 83 | 81 | 79 | 81 | 84 |
| Wind speed (km/h) | 10.2 | 10.6 | 10.8 | 9.6 | 8.4 | 7.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 77 | 66 | 74 | 70 | 74 | 80 |
| Relative humidity (%) | 86 | 84 | 85 | 84 | 84 | 85 |
| Wind speed (km/h) | 7.2 | 7.1 | 7.9 | 8.2 | 8.2 | 9.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kyoto, about 12 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.