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Chikuma, Japan climate
Cfa Humid subtropical
Chikuma has a strongly seasonal cool-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 −6°C at night. Around 1108 mm of precipitation falls each year, peaking in September (149 mm) and easing off in December (51 mm).
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)Chikuma climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 5 | 10 | 17 | 23 | 26 | 29 | 30 | 25 | 19 | 13 | 7 |
| Avg temp (°C) | −1 | −1 | 3 | 9 | 15 | 19 | 23 | 24 | 20 | 13 | 7 | 1 |
| Avg low (°C) | −6 | −5 | −2 | 3 | 9 | 14 | 19 | 20 | 16 | 9 | 2 | −3 |
| Precipitation (mm) | 56 | 52 | 76 | 76 | 89 | 123 | 147 | 111 | 149 | 123 | 54 | 51 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 4 | 5 | 10 | 17 | 23 | 26 |
| Avg temp (°C) | −1 | −1 | 3 | 9 | 15 | 19 |
| Avg low (°C) | −6 | −5 | −2 | 3 | 9 | 14 |
| Precipitation (mm) | 56 | 52 | 76 | 76 | 89 | 123 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 25 | 19 | 13 | 7 |
| Avg temp (°C) | 23 | 24 | 20 | 13 | 7 | 1 |
| Avg low (°C) | 19 | 20 | 16 | 9 | 2 | −3 |
| Precipitation (mm) | 147 | 111 | 149 | 123 | 54 | 51 |
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 (%) | 90 | 87 | 82 | 76 | 75 | 79 | 81 | 81 | 83 | 84 | 85 | 88 |
| Wind speed (mph) | 5.4 | 5.8 | 5.7 | 4.9 | 4.0 | 3.1 | 3.0 | 2.8 | 3.0 | 3.3 | 3.8 | 4.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 75 | 73 | 69 | 71 | 80 |
| Relative humidity (%) | 90 | 87 | 82 | 76 | 75 | 79 |
| Wind speed (mph) | 5.4 | 5.8 | 5.7 | 4.9 | 4.0 | 3.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 70 | 76 | 71 | 72 | 77 |
| Relative humidity (%) | 81 | 81 | 83 | 84 | 85 | 88 |
| Wind speed (mph) | 3.0 | 2.8 | 3.0 | 3.3 | 3.8 | 4.8 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Shinshushimmachi, 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.