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Shiojiri, Japan climate
Cfa Humid subtropical
Shiojiri has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 87°F, while the coldest is January averaging around 19°F at night. Precipitation totals about 43 inches a year and is strongly seasonal — October alone averages 5.9 inches while January barely receives 1.36 inches.
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)Shiojiri climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 43 | 51 | 62 | 73 | 78 | 84 | 87 | 78 | 66 | 56 | 45 |
| Avg temp (°F) | 29 | 32 | 39 | 50 | 60 | 67 | 74 | 76 | 68 | 56 | 45 | 35 |
| Avg low (°F) | 19 | 21 | 28 | 37 | 48 | 58 | 66 | 67 | 60 | 47 | 34 | 25 |
| Precipitation (in) | 1.4 | 1.6 | 3.1 | 3.6 | 4.1 | 4.5 | 5.8 | 3.9 | 5.6 | 5.9 | 2.4 | 1.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 39 | 43 | 51 | 62 | 73 | 78 |
| Avg temp (°F) | 29 | 32 | 39 | 50 | 60 | 67 |
| Avg low (°F) | 19 | 21 | 28 | 37 | 48 | 58 |
| Precipitation (in) | 1.4 | 1.6 | 3.1 | 3.6 | 4.1 | 4.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 84 | 87 | 78 | 66 | 56 | 45 |
| Avg temp (°F) | 74 | 76 | 68 | 56 | 45 | 35 |
| Avg low (°F) | 66 | 67 | 60 | 47 | 34 | 25 |
| Precipitation (in) | 5.8 | 3.9 | 5.6 | 5.9 | 2.4 | 1.6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 75 | 73 | 69 | 71 | 80 | 79 | 70 | 76 | 71 | 72 | 77 |
| Relative humidity (%) | 88 | 85 | 80 | 76 | 75 | 80 | 83 | 82 | 84 | 85 | 85 | 86 |
| Wind speed (mph) | 5.6 | 5.8 | 5.7 | 5.3 | 4.4 | 3.6 | 3.7 | 3.2 | 3.4 | 3.6 | 4.3 | 5.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 75 | 73 | 69 | 71 | 80 |
| Relative humidity (%) | 88 | 85 | 80 | 76 | 75 | 80 |
| Wind speed (mph) | 5.6 | 5.8 | 5.7 | 5.3 | 4.4 | 3.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 70 | 76 | 71 | 72 | 77 |
| Relative humidity (%) | 83 | 82 | 84 | 85 | 85 | 86 |
| Wind speed (mph) | 3.7 | 3.2 | 3.4 | 3.6 | 4.3 | 5.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Matsumoto-imai, about 8 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.