Asahi, Japan climate
Cfa Humid subtropical
Asahi has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 83°F, while the coldest is January averaging around 37°F at night. Around 67 inches of precipitation falls each year, peaking in October (10.7 inches) and easing off in February (3.6 inches).
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Summers
Warm
Highs near 83°F in August.
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Winters
Chilly
Lows near 37°F in January.
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Rain
Very wet
About 67 in of rain a year.
Wettest in October
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Sky & trend
Often cloudy
Cloudy skies much of the year.
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)Asahi climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 51 | 55 | 63 | 69 | 73 | 80 | 83 | 79 | 71 | 63 | 55 |
| Avg temp (°F) | 44 | 44 | 49 | 57 | 63 | 68 | 74 | 78 | 74 | 67 | 58 | 49 |
| Avg low (°F) | 37 | 38 | 44 | 51 | 59 | 64 | 70 | 74 | 70 | 62 | 52 | 42 |
| Precipitation (in) | 4.2 | 3.6 | 5.9 | 5.0 | 5.3 | 6.5 | 5.1 | 3.7 | 8.5 | 10.7 | 5.2 | 3.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 50 | 51 | 55 | 63 | 69 | 73 |
| Avg temp (°F) | 44 | 44 | 49 | 57 | 63 | 68 |
| Avg low (°F) | 37 | 38 | 44 | 51 | 59 | 64 |
| Precipitation (in) | 4.2 | 3.6 | 5.9 | 5.0 | 5.3 | 6.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 83 | 79 | 71 | 63 | 55 |
| Avg temp (°F) | 74 | 78 | 74 | 67 | 58 | 49 |
| Avg low (°F) | 70 | 74 | 70 | 62 | 52 | 42 |
| Precipitation (in) | 5.1 | 3.7 | 8.5 | 10.7 | 5.2 | 3.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 65 | 70 | 69 | 72 | 81 | 74 | 60 | 71 | 72 | 68 | 62 |
| Relative humidity (%) | 72 | 72 | 73 | 76 | 80 | 86 | 89 | 86 | 82 | 77 | 74 | 73 |
| Wind speed (mph) | 13.3 | 13.3 | 13.1 | 12.2 | 10.9 | 9.5 | 9.2 | 8.9 | 10.6 | 11.7 | 11.5 | 12.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 65 | 70 | 69 | 72 | 81 |
| Relative humidity (%) | 72 | 72 | 73 | 76 | 80 | 86 |
| Wind speed (mph) | 13.3 | 13.3 | 13.1 | 12.2 | 10.9 | 9.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 60 | 71 | 72 | 68 | 62 |
| Relative humidity (%) | 89 | 86 | 82 | 77 | 74 | 73 |
| Wind speed (mph) | 9.2 | 8.9 | 10.6 | 11.7 | 11.5 | 12.6 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Choshi, about 19 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.