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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 74°F, while the coldest is January averaging around 17°F at night. Precipitation totals about 49 inches a year and is strongly seasonal — August alone averages 7.8 inches while February barely receives 1.48 inches.
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 (°F) | 33 | 34 | 40 | 49 | 57 | 63 | 70 | 74 | 71 | 61 | 49 | 37 |
| Avg temp (°F) | 26 | 26 | 33 | 42 | 50 | 57 | 65 | 69 | 64 | 53 | 41 | 30 |
| Avg low (°F) | 17 | 18 | 25 | 34 | 44 | 53 | 61 | 64 | 57 | 44 | 32 | 22 |
| Precipitation (in) | 1.5 | 1.5 | 2.1 | 3.0 | 5.2 | 4.4 | 6.4 | 7.8 | 6.9 | 4.5 | 3.4 | 2.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 33 | 34 | 40 | 49 | 57 | 63 |
| Avg temp (°F) | 26 | 26 | 33 | 42 | 50 | 57 |
| Avg low (°F) | 17 | 18 | 25 | 34 | 44 | 53 |
| Precipitation (in) | 1.5 | 1.5 | 2.1 | 3.0 | 5.2 | 4.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 70 | 74 | 71 | 61 | 49 | 37 |
| Avg temp (°F) | 65 | 69 | 64 | 53 | 41 | 30 |
| Avg low (°F) | 61 | 64 | 57 | 44 | 32 | 22 |
| Precipitation (in) | 6.4 | 7.8 | 6.9 | 4.5 | 3.4 | 2.2 |
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.