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Tomakomai, Japan climate
Dfb Warm-summer humid continental
Tomakomai has a seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is August with an average daily high near 23°C, while the coldest is January averaging around −8°C at night. Precipitation totals about 1239 mm a year and is strongly seasonal — August alone averages 198 mm while February barely receives 37 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)Tomakomai climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 1 | 4 | 10 | 14 | 17 | 21 | 23 | 22 | 16 | 9 | 3 |
| Avg temp (°C) | −4 | −3 | 1 | 5 | 10 | 14 | 18 | 20 | 18 | 12 | 5 | −1 |
| Avg low (°C) | −8 | −8 | −4 | 1 | 7 | 12 | 16 | 18 | 14 | 6 | 0 | −5 |
| Precipitation (mm) | 39 | 37 | 53 | 76 | 131 | 112 | 163 | 198 | 175 | 113 | 86 | 57 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 1 | 4 | 10 | 14 | 17 |
| Avg temp (°C) | −4 | −3 | 1 | 5 | 10 | 14 |
| Avg low (°C) | −8 | −8 | −4 | 1 | 7 | 12 |
| Precipitation (mm) | 39 | 37 | 53 | 76 | 131 | 112 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 21 | 23 | 22 | 16 | 9 | 3 |
| Avg temp (°C) | 18 | 20 | 18 | 12 | 5 | −1 |
| Avg low (°C) | 16 | 18 | 14 | 6 | 0 | −5 |
| Precipitation (mm) | 163 | 198 | 175 | 113 | 86 | 57 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 76 | 71 | 71 | 71 | 76 | 79 | 75 | 70 | 69 | 77 | 81 |
| Relative humidity (%) | 89 | 86 | 84 | 83 | 85 | 87 | 90 | 88 | 84 | 80 | 83 | 88 |
| Wind speed (mph) | 9.4 | 9.4 | 8.4 | 6.3 | 4.8 | 4.1 | 4.1 | 4.5 | 5.8 | 6.9 | 8.1 | 9.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 81 | 76 | 71 | 71 | 71 | 76 |
| Relative humidity (%) | 89 | 86 | 84 | 83 | 85 | 87 |
| Wind speed (mph) | 9.4 | 9.4 | 8.4 | 6.3 | 4.8 | 4.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 79 | 75 | 70 | 69 | 77 | 81 |
| Relative humidity (%) | 90 | 88 | 84 | 80 | 83 | 88 |
| Wind speed (mph) | 4.1 | 4.5 | 5.8 | 6.9 | 8.1 | 9.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Tomakomai, about 5 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.