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Weather & Climate in Tomakomai, Japan
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Tomakomai has a cool climate with an average annual temperature of 45°F (7°C). Winters average 22°F in January while summers reach 65°F in July. The area gets 252 sunny days per year, above the national average. Annual precipitation totals 46.3 inches (wetter than the 38-inch national average). The area receives 8.6 inches of snow annually. The city sits at an elevation of 23 feet.
Temperature
22°F Jan (-5°C)
65°F Jul (18°C)
| Annual Average | 45.0°F |
| 17% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 252 days/yr |
Geography
| Elevation | 23 ft (7 m) |
| Area | 433.7 sq mi (1,123.3 km²) |
| Population Density | 403/sq mi |
| Coordinates | 42.6369°N, 141.6033°W |
| Timezone | Asia/Tokyo |
Precipitation & Snow
Air Quality
Earthquake History
1,070 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.9.
| Feb 2, 2013 | 18 km SSW of Obihiro, Japan | M6.9 | 123 km | 107 km |
| Jan 14, 2016 | 52 km SE of Shizunai-furukawach?, Japan | M6.7 | 122 km | 46 km |
| Nov 26, 1991 | 33 km SSE of Shizunai-furukawach?, Japan | M6.4 | 100 km | 56 km |
| Jun 11, 2023 | 20 km WSW of Biratori, Japan | M6.2 | 27 km | 121 km |
| Aug 24, 1992 | 9 km NNW of Honch?, Japan | M6.2 | 107 km | 121 km |
| Jul 12, 1992 | 70 km ENE of Mutsu, Japan | M6.2 | 136 km | 64 km |
| Jun 8, 2015 | 74 km ENE of Mutsu, Japan | M6.1 | 125 km | 42 km |
| Feb 20, 1997 | 61 km SSE of Shizunai-furukawach?, Japan | M6.0 | 128 km | 33 km |
| Aug 25, 2012 | 45 km ENE of Shizunai-furukawach?, Japan | M5.9 | 110 km | 55 km |
| May 5, 2023 | 68 km ENE of Mutsu, Japan | M5.9 | 129 km | 59 km |
| Sep 13, 2010 | 68 km ENE of Mutsu, Japan | M5.8 | 131 km | 45 km |
| Jun 10, 2004 | 49 km E of Shizunai-furukawach?, Japan | M5.8 | 114 km | 50 km |
| Jun 12, 1991 | 17 km SE of Obihiro, Japan | M5.8 | 142 km | 109 km |
| Apr 29, 2008 | 70 km ENE of Mutsu, Japan | M5.8 | 136 km | 47 km |
| Jan 30, 1998 | 70 km ENE of Mutsu, Japan | M5.8 | 135 km | 33 km |
| Apr 3, 2002 | 60 km ENE of Mutsu, Japan | M5.7 | 123 km | 71 km |
| Mar 7, 2017 | 62 km ENE of Mutsu, Japan | M5.7 | 127 km | 56 km |
| Jan 11, 1995 | 45 km SSE of Shizunai-furukawach?, Japan | M5.6 | 107 km | 57 km |
| May 23, 1995 | Hokkaido, Japan region | M5.6 | 114 km | 17 km |
| Sep 10, 2017 | 75 km SE of Shizunai-furukawach?, Japan | M5.5 | 143 km | 45 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
2 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 1.
| Year | Name | Category | Max Wind | Closest |
| 2002 | Higos | Category 1 | 69 mph | 238 km |
| 1998 | Vicki | Category 1 | 58 mph | 282 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 8.0 m (26 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1640 | SE. HOKKAIDO ISLAND | Explosion | 8.0 m | 700 | 99 km |
| 1947 | W. HOKKAIDO ISLAND | Earthquake | 2.0 m | — | 138 km |
| 1982 | HOKKAIDO ISLAND | Earthquake | 1.3 m | 110 | 82 km |
| 1834 | W. HOKKAIDO ISLAND | Earthquake | — | — | 76 km |
| 1792 | W. HOKKAIDO ISLAND | Earthquake | — | — | 126 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
11 volcanoes within 200 km. Closest: Shikotsu (19 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Shikotsu | Caldera | 1,320 m (4,331 ft) | 1979 | 19 km |
| Kuttara | Stratovolcano(es) | 549 m (1,801 ft) | 1820 | 40 km |
| Toya | Stratovolcano | 733 m (2,405 ft) | 2001 | 63 km |
| Yoteizan | Stratovolcano | 1,888 m (6,194 ft) | -1050 | 68 km |
| Niseko | Stratovolcano(es) | 1,308 m (4,291 ft) | -4900 | 82 km |
| Esan | Lava dome(s) | 618 m (2,028 ft) | 1874 | 99 km |
| Hokkaido-Komagatake | Stratovolcano | 1,131 m (3,711 ft) | 2000 | 99 km |
| Tokachidake | Stratovolcano(es) | 2,077 m (6,814 ft) | 2004 | 124 km |
| Maruyama | Stratovolcano(es) | 2,013 m (6,604 ft) | 1898 | 145 km |
| Taisetsuzan | Stratovolcano(es) | 2,291 m (7,516 ft) | 1739 | 153 km |
| Osorezan | Stratovolcano | 878 m (2,881 ft) | 1787 | 156 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 2.1 in | Coldest |
| February | 24°F (-5°C) | 1.8 in | Driest |
| March | 31°F (-1°C) | 2.3 in | |
| April | 41°F (5°C) | 3.2 in | |
| May | 50°F (10°C) | 3.9 in | |
| June | 57°F (14°C) | 3.8 in | |
| July | 65°F (18°C) | 5.6 in | |
| August | 69°F (21°C) | 7.2 in | Warmest, Wettest |
| September | 63°F (17°C) | 6.3 in | |
| October | 51°F (11°C) | 4.3 in | |
| November | 39°F (4°C) | 3.4 in | |
| December | 29°F (-2°C) | 2.4 in |
Tomakomai has a seasonal temperature swing of 47°F / from 22°F in January to 69°F in August. Total annual precipitation is 46.3 inches, with August being the wettest month (7.2") and February the driest (1.8").