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Aihara, Japan climate
Cfa Humid subtropical
Aihara has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 89°F, while the coldest is January averaging around 29°F at night. Precipitation totals about 65 inches a year and is strongly seasonal — September alone averages 10.4 inches while February barely receives 1.81 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)Aihara climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 51 | 57 | 66 | 74 | 79 | 86 | 89 | 81 | 71 | 62 | 53 |
| Avg temp (°F) | 38 | 40 | 46 | 56 | 65 | 71 | 78 | 80 | 73 | 62 | 52 | 43 |
| Avg low (°F) | 29 | 30 | 37 | 46 | 55 | 63 | 71 | 72 | 66 | 55 | 44 | 33 |
| Precipitation (in) | 2.1 | 1.8 | 4.1 | 4.5 | 4.9 | 6.8 | 7.4 | 8.4 | 10.4 | 9.1 | 3.2 | 2.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 49 | 51 | 57 | 66 | 74 | 79 |
| Avg temp (°F) | 38 | 40 | 46 | 56 | 65 | 71 |
| Avg low (°F) | 29 | 30 | 37 | 46 | 55 | 63 |
| Precipitation (in) | 2.1 | 1.8 | 4.1 | 4.5 | 4.9 | 6.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 86 | 89 | 81 | 71 | 62 | 53 |
| Avg temp (°F) | 78 | 80 | 73 | 62 | 52 | 43 |
| Avg low (°F) | 71 | 72 | 66 | 55 | 44 | 33 |
| Precipitation (in) | 7.4 | 8.4 | 10.4 | 9.1 | 3.2 | 2.1 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 52 | 60 | 64 | 70 | 82 | 75 | 64 | 71 | 67 | 56 | 45 |
| Relative humidity (%) | 77 | 76 | 77 | 77 | 79 | 83 | 84 | 82 | 84 | 84 | 82 | 79 |
| Wind speed (mph) | 5.5 | 6.0 | 6.4 | 6.5 | 5.9 | 5.2 | 5.5 | 5.2 | 5.4 | 5.3 | 5.0 | 5.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 52 | 60 | 64 | 70 | 82 |
| Relative humidity (%) | 77 | 76 | 77 | 77 | 79 | 83 |
| Wind speed (mph) | 5.5 | 6.0 | 6.4 | 6.5 | 5.9 | 5.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 64 | 71 | 67 | 56 | 45 |
| Relative humidity (%) | 84 | 82 | 84 | 84 | 82 | 79 |
| Wind speed (mph) | 5.5 | 5.2 | 5.4 | 5.3 | 5.0 | 5.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Hachioji, about 7 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.