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Hekinan, Japan climate
Cfa Humid subtropical
Hekinan has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 34°C, while the coldest is January averaging around 1°C at night. Precipitation totals about 1513 mm a year and is strongly seasonal — October alone averages 223 mm while January barely receives 53 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)Hekinan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 10 | 15 | 20 | 25 | 28 | 32 | 34 | 29 | 24 | 18 | 12 |
| Avg temp (°C) | 5 | 6 | 10 | 15 | 20 | 23 | 27 | 29 | 25 | 19 | 13 | 7 |
| Avg low (°C) | 1 | 2 | 5 | 10 | 15 | 19 | 24 | 25 | 21 | 15 | 9 | 3 |
| Precipitation (mm) | 53 | 56 | 114 | 141 | 128 | 164 | 178 | 141 | 187 | 223 | 62 | 65 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 10 | 15 | 20 | 25 | 28 |
| Avg temp (°C) | 5 | 6 | 10 | 15 | 20 | 23 |
| Avg low (°C) | 1 | 2 | 5 | 10 | 15 | 19 |
| Precipitation (mm) | 53 | 56 | 114 | 141 | 128 | 164 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 32 | 34 | 29 | 24 | 18 | 12 |
| Avg temp (°C) | 27 | 29 | 25 | 19 | 13 | 7 |
| Avg low (°C) | 24 | 25 | 21 | 15 | 9 | 3 |
| Precipitation (mm) | 178 | 141 | 187 | 223 | 62 | 65 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 67 | 65 | 70 | 81 | 75 | 63 | 70 | 66 | 63 | 63 |
| Relative humidity (%) | 81 | 78 | 76 | 76 | 78 | 82 | 83 | 82 | 81 | 80 | 80 | 82 |
| Wind speed (mph) | 8.1 | 8.3 | 8.1 | 7.1 | 6.2 | 5.3 | 5.0 | 5.2 | 5.7 | 6.0 | 6.4 | 7.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 67 | 67 | 65 | 70 | 81 |
| Relative humidity (%) | 81 | 78 | 76 | 76 | 78 | 82 |
| Wind speed (mph) | 8.1 | 8.3 | 8.1 | 7.1 | 6.2 | 5.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 75 | 63 | 70 | 66 | 63 | 63 |
| Relative humidity (%) | 83 | 82 | 81 | 80 | 80 | 82 |
| Wind speed (mph) | 5.0 | 5.2 | 5.7 | 6.0 | 6.4 | 7.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Obu, about 13 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.