Tomakomai in Winter
In winter (December, January and February), Tomakomai sees average daytime highs around -1°C and overnight lows near -6°C, with 150 mm of precipitation over about 23 wet days across the season. It is the coldest season of the year and the driest season of the year.
Over the season highs ease from about 3°C in early December to -0°C by late February. The sky is clear or mostly clear about 20% of the time across winter, and the air most often feels dry.
Winter is Tomakomai's weakest season of the year to visit on our travel score. For the whole year in context, see Tomakomai's year-round climate.
- Avg daytime high
- -1°C
- coldest season of the year
- Avg overnight low
- -6°C
- Precipitation
- 150 mm
- 23 wet days
- Avg wind
- 13 km/h
- Travel score
- 0.0
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Tomakomai in Winter
Over the season highs ease from about 3°C in early December to -0°C by late February.
A typical winter day in Tomakomai reaches about -1°C and drops to -6°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Tomakomai
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 90 that feel at or below 0°C.
The story in winter is cold — wind chill drags the overnight "feels like" below the raw low.
Tomakomai weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -2° / -7° | 44 | 7.1 | 8.8 | 9.2 | 0.0 |
| Feb | -1° / -7° | 43 | 7.3 | 9 | 10.3 | 0.0 |
| Mar | 2° / -4° | 63 | 10.3 | 9.3 | 11.6 | 0.0 |
| Apr | 7° / 2° | 78 | 11.5 | 3.2 | 13.1 | 1.1 |
| May | 13° / 7° | 109 | 11.8 | 0.1 | 14.4 | 3.2 |
| Jun | 16° / 12° | 100 | 11.3 | 0 | 15.1 | 4.8 |
| Jul | 20° / 16° | 138 | 13.7 | 0 | 14.8 | 5.6 |
| Aug | 22° / 18° | 197 | 14.5 | 0 | 13.7 | 5.8 |
| Sep | 20° / 15° | 177 | 15 | 0 | 12.3 | 5.4 |
| Oct | 14° / 8° | 110 | 11.8 | 0.2 | 10.8 | 4.0 |
| Nov | 7° / 2° | 78 | 10.8 | 3 | 9.6 | 0.9 |
| Dec | 1° / -4° | 63 | 8.7 | 8.6 | 8.9 | 0.0 |
Cloud cover in Winter
The sky is clear or mostly clear about 20% of the time across winter.
Chance of precipitation in Winter
Tomakomai gets around 150 mm of rain and snow over 23 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 13 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 06 min in early December to 10 h 54 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 2.3 kWh/m².
Hazard calendar for Tomakomai
In winter, Tomakomai overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Tomakomai sits in the Pacific typhoon belt; the season peaks July–October.
Tomakomai's rainy season runs May–October, when most of the year's rain falls.
Is winter a good time to visit Tomakomai?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a weaker month for outdoor sightseeing in Tomakomai.
What to pack for Tomakomai in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Tomakomai sees daytime highs around -1°C and nights near -6°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 23 days see rain.
Sea temperature near Tomakomai in Winter
The nearest coast averages about 6°C across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 20°C and coldest in March near 3°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 4 | 3 | 5 | 8 | 13 | 17 | 20 | 20 | 16 | 13 | 10 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 4 | Bracing |
| Mar | 3 | Bracing |
| Apr | 5 | Bracing |
| May | 8 | Bracing |
| Jun | 13 | Bracing |
| Jul | 17 | Cool |
| Aug | 20 | Refreshing |
| Sep | 20 | Cool |
| Oct | 16 | Cool |
| Nov | 13 | Bracing |
| Dec | 10 | Bracing |
UV index in Tomakomai in Winter
Clear-sky midday UV across winter averages around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Tomakomai peaks around August 18 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 6 | 7 | 6 | 5 | 8 | 6 | 4 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | High | Moderate | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 3 | Moderate |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 6 | High |
| Jul | 5 | Moderate |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Tomakomai in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Tomakomai is worst in April — around 19 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 14 | 19 | 19 | 18 | 13 | 12 | 10 | 9 | 11 | 9 | 8 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 14 | Moderate |
| Mar | 19 | Moderate |
| Apr | 19 | Moderate |
| May | 18 | Moderate |
| Jun | 13 | Moderate |
| Jul | 12 | Good |
| Aug | 10 | Good |
| Sep | 9 | Good |
| Oct | 11 | Good |
| Nov | 9 | Good |
| Dec | 8 | Good |
Where is Tomakomai?
Tomakomai sits at 42.6°N, 141.6°E, 7 m above sea level, in Japan. The nearest listed city is Chitose, 21 km away.
Topography around Tomakomai
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Tomakomai.
Within 3 km, the terrain around Tomakomai has only modest variations in elevation — a maximum elevation change of 58 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 439 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,859 m.
The land around Tomakomai is covered by artificial surfaces (47%) and water (31%) within 3 km, water (42%) and trees (41%) within 16 km, and trees (51%) and water (33%) within 80 km.
Japan travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 100 V · 50 / 60 Hz
- Prices
- ≈ 65% of US
- price level, 2025
- GDP per capita
- $35,951
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.2
- per 100k, 2023
- Road deaths
- 3.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very low
- EF EPI 446
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Tomakomai (42.6369°, 141.6033°, elevation 7 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.