Itō, Japan climate
Cfa Humid subtropical
Itō has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 30°C, while the coldest is January averaging around 4°C at night. Around 2013 mm of precipitation falls each year, peaking in September (264 mm) and easing off in December (66 mm).
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Summers
Warm
Highs near 30°C in August.
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Winters
Chilly
Lows near 4°C in January.
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Rain
Very wet
About 2013 mm of rain a year.
Wettest in September
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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)Itō climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 11 | 14 | 19 | 23 | 25 | 29 | 30 | 27 | 22 | 17 | 13 |
| Avg temp (°C) | 7 | 7 | 10 | 15 | 19 | 21 | 25 | 26 | 23 | 19 | 14 | 10 |
| Avg low (°C) | 4 | 4 | 7 | 11 | 15 | 19 | 23 | 24 | 21 | 16 | 11 | 7 |
| Precipitation (mm) | 76 | 82 | 158 | 168 | 173 | 252 | 242 | 186 | 264 | 237 | 108 | 66 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 11 | 11 | 14 | 19 | 23 | 25 |
| Avg temp (°C) | 7 | 7 | 10 | 15 | 19 | 21 |
| Avg low (°C) | 4 | 4 | 7 | 11 | 15 | 19 |
| Precipitation (mm) | 76 | 82 | 158 | 168 | 173 | 252 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 27 | 22 | 17 | 13 |
| Avg temp (°C) | 25 | 26 | 23 | 19 | 14 | 10 |
| Avg low (°C) | 23 | 24 | 21 | 16 | 11 | 7 |
| Precipitation (mm) | 242 | 186 | 264 | 237 | 108 | 66 |
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 (%) | 70 | 70 | 73 | 77 | 81 | 86 | 89 | 86 | 83 | 79 | 75 | 71 |
| Wind speed (km/h) | 16.0 | 15.7 | 16.0 | 14.8 | 12.7 | 11.3 | 11.2 | 11.2 | 13.0 | 14.7 | 14.5 | 15.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 52 | 60 | 64 | 70 | 82 |
| Relative humidity (%) | 70 | 70 | 73 | 77 | 81 | 86 |
| Wind speed (km/h) | 16.0 | 15.7 | 16.0 | 14.8 | 12.7 | 11.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 64 | 71 | 67 | 56 | 45 |
| Relative humidity (%) | 89 | 86 | 83 | 79 | 75 | 71 |
| Wind speed (km/h) | 11.2 | 11.2 | 13.0 | 14.7 | 14.5 | 15.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Ajiro, about 9 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.