Tōmi weather in January

In January, Tōmi sees average daytime highs of 3°C and overnight lows near -6°C, with 62 mm of precipitation across 9.8 wet days and about 9.8 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 3°C through the month. The sky is clear or mostly clear about 30% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 36 min at the start of January to 10 h 06 min by month's end. Set against the rest of the year, January is Tōmi's 3rd-clearest and 4th-windiest month. For the whole year in context, see Tōmi's year-round climate.

Daytime high: 3°; 12th warmest
Overnight low: -6°; 1st coldest
Precipitation: 62 mm; 9.8 wet days
Daylight: 9 h 48 min; 7:03 AM – 4:49 PM
Cloud cover: 55%; 3rd clearest
Wind: 6 km/h; 4th windiest
Solar energy: 2.93 kWh/m²
Travel score: 0.0; out of 10

Tōmi is city in Nagano Prefecture, Japan.

Density: 268/km²; people per km²
Founded: 2004

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← December Tōmi year-round climate February →Best places to visit in January

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 3°C through the month.

A typical January day in Tōmi reaches about 3°C in the afternoon and slips back to -6°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between -1°C and 7°C. Set against its neighbours, January runs about 3°C cooler than December and about 1°C cooler than February.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	2	2	2	2	2	2	2	2	2	2	2	2	2	3
Avg low (°C)	-4	-5	-5	-5	-5	-5	-5	-5	-5	-5	-5	-5	-5	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6	-6

	Avg high (°C)	Avg low (°C)
1	3	-4
2	3	-5
3	3	-5
4	3	-5
5	3	-5
6	3	-5
7	3	-5
8	3	-5
9	3	-5
10	3	-5
11	3	-5
12	3	-5
13	3	-5
14	3	-6
15	3	-6
16	3	-6
17	3	-6
18	2	-6
19	2	-6
20	2	-6
21	2	-6
22	2	-6
23	2	-6
24	2	-6
25	2	-6
26	2	-6
27	2	-6
28	2	-6
29	2	-6
30	2	-6
31	3	-6

How January really feels in Tōmi

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Tōmi weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	3° / -6°	62	9.8	10.1	9.8	0.0
Feb	4° / -5°	65	9.4	8.2	10.6	0.0
Mar	8° / -2°	107	12.4	7.3	11.7	1.3
Apr	14° / 4°	100	11.4	1.8	12.9	4.2
May	20° / 9°	108	11.1	0	13.9	6.1
Jun	23° / 14°	141	13.7	0	14.4	5.8
Jul	26° / 18°	161	14.5	0	14.2	5.7
Aug	28° / 19°	98	11.5	0	13.4	5.9
Sep	24° / 15°	137	11.7	0	12.2	6.3
Oct	17° / 9°	143	10.8	0	11.1	5.5
Nov	12° / 2°	70	9	1.1	10.1	3.1
Dec	6° / -2°	59	9.6	7	9.6	0.5

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 26% of January, with mostly cloudy or overcast conditions the remaining 44%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	61	61	62	62	61	61	61	60	60	59	58	57	57	55	55	55	53	53	52	52	52	52	52	52	52	52	52	53	54	54	54
Cloudier (%)	39	39	38	38	39	39	39	40	40	41	42	43	43	45	45	45	47	47	48	48	48	48	48	48	48	48	48	47	46	46	46

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	61	39
6	61	39
7	61	39
8	60	40
9	60	40
10	59	41
11	58	42
12	57	43
13	57	43
14	55	45
15	55	45
16	55	45
17	53	47
18	53	47
19	52	48
20	52	48
21	52	48
22	52	48
23	52	48
24	52	48
25	52	48
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

Chance of precipitation in January

Any precipitationSnow

Tōmi gets around 62 mm of rain and snow over 9.8 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 32% and peaks near 34% on the wettest days, and about 10 days bring snow.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	32	32	32	31	31	31	30	30	30	30	30	30	30	31	31	31	31	32	32	32	33	33	33	34	34	34	34	33	33	33	33
Snow chance (%)	31	31	31	31	31	31	31	31	31	31	31	32	32	32	33	33	34	34	34	35	35	35	35	35	35	34	34	33	32	32	32

	Rain chance (%)	Snow chance (%)
1	32	31
2	32	31
3	32	31
4	31	31
5	31	31
6	31	31
7	30	31
8	30	31
9	30	31
10	30	31
11	30	31
12	30	32
13	30	32
14	31	32
15	31	33
16	31	33
17	31	34
18	32	34
19	32	34
20	32	35
21	33	35
22	33	35
23	33	35
24	34	35
25	34	35
26	34	34
27	34	34
28	33	33
29	33	32
30	33	32
31	33	32

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in January

Winds average 6 km/h in January.

Across January, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	6	calm
6	6	calm
7	6	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm
31	6	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 9 h 36 min at the start of January to 10 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over January. Sunrise moves from 7:03 AM to 6:56 AM, and sunset from 4:37 PM to 5:04 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	9.6	9.6	9.6	9.6	9.6	9.6	9.6	9.6	9.7	9.7	9.7	9.7	9.7	9.7	9.8	9.8	9.8	9.8	9.8	9.9	9.9	9.9	9.9	10.0	10.0	10.0	10.0	10.1	10.1	10.1	10.1
Sunrise (AM)	7:03	7:03	7:03	7:03	7:03	7:04	7:04	7:04	7:04	7:03	7:03	7:03	7:03	7:03	7:03	7:03	7:02	7:02	7:02	7:01	7:01	7:01	7:00	7:00	6:59	6:59	6:58	6:57	6:57	6:56	6:56
Sunset (PM)	4:37	4:37	4:38	4:39	4:40	4:40	4:41	4:42	4:43	4:44	4:45	4:45	4:46	4:47	4:48	4:49	4:50	4:51	4:52	4:53	4:54	4:55	4:56	4:57	4:58	4:59	5:00	5:01	5:02	5:03	5:04

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.6	7:03	4:37
2	9.6	7:03	4:37
3	9.6	7:03	4:38
4	9.6	7:03	4:39
5	9.6	7:03	4:40
6	9.6	7:04	4:40
7	9.6	7:04	4:41
8	9.6	7:04	4:42
9	9.7	7:04	4:43
10	9.7	7:03	4:44
11	9.7	7:03	4:45
12	9.7	7:03	4:45
13	9.7	7:03	4:46
14	9.7	7:03	4:47
15	9.8	7:03	4:48
16	9.8	7:03	4:49
17	9.8	7:02	4:50
18	9.8	7:02	4:51
19	9.8	7:02	4:52
20	9.9	7:01	4:53
21	9.9	7:01	4:54
22	9.9	7:01	4:55
23	9.9	7:00	4:56
24	10.0	7:00	4:57
25	10.0	6:59	4:58
26	10.0	6:59	4:59
27	10.0	6:58	5:00
28	10.1	6:57	5:01
29	10.1	6:57	5:02
30	10.1	6:56	5:03
31	10.1	6:56	5:04

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.93 kWh/m².

For context, solar energy here swings from a low near 2.51 kWh/m² to a high of 5.79 kWh/m² in May across the year — January's 2.93 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	2.7	2.7	2.7	2.7	2.7	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.8	2.9	2.9	2.9	2.9	3.0	3.0	3.0	3.0	3.1	3.1	3.1	3.2	3.2	3.3	3.3	3.3
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	2.7	Moderate
2	2.7	Moderate
3	2.7	Moderate
4	2.7	Moderate
5	2.7	Moderate
6	2.8	Moderate
7	2.8	Moderate
8	2.8	Moderate
9	2.8	Moderate
10	2.8	Moderate
11	2.8	Moderate
12	2.8	Moderate
13	2.8	Moderate
14	2.8	Moderate
15	2.8	Moderate
16	2.9	Moderate
17	2.9	Moderate
18	2.9	Moderate
19	2.9	Moderate
20	3.0	Moderate
21	3.0	Moderate
22	3.0	Moderate
23	3.0	Moderate
24	3.1	Moderate
25	3.1	Moderate
26	3.1	Moderate
27	3.2	Moderate
28	3.2	Moderate
29	3.3	Moderate
30	3.3	Moderate
31	3.3	Moderate

Planning a trip in January

Is January a good time to visit Tōmi?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0

Sightseeing

11th-best month of the year

0.0

Beach & pool

9th-best month of the year

January is a weaker month for outdoor sightseeing in Tōmi.

What to pack for Tōmi in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Tōmi sees daytime highs around 3°C and nights near -6°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

UV index in Tōmi in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tōmi peaks around July 18 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	4	5	7	9	10	10	10	9	6	3	2
Level	Moderate	Moderate	High	Very high	Very high	Very high	Very high	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	4	Moderate
Mar	5	High
Apr	7	Very high
May	9	Very high
Jun	10	Very high
Jul	10	Very high
Aug	10	Very high
Sep	9	Very high
Oct	6	High
Nov	3	Moderate
Dec	2	Moderate

Air quality in Tōmi in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Tōmi is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.3× 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)	9	11	17	18	17	16	13	12	10	10	9	8
Level	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	9	Good
Feb	11	Good
Mar	17	Moderate
Apr	18	Moderate
May	17	Moderate
Jun	16	Moderate
Jul	13	Moderate
Aug	12	Good
Sep	10	Good
Oct	10	Good
Nov	9	Good
Dec	8	Good

Location & terrain

Where is Tōmi?

Tōmi sits at 36.4°N, 138.4°E, 639 m above sea level, in Japan. The nearest listed city is Komoro, 8.0 km away.

Topography around Tōmi

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Tōmi.

Within 3 km, the terrain around Tōmi has significant variations in elevation — a maximum elevation change of 474 m around an average of 661 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,148 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,154 m.

The land around Tōmi is covered by trees (32%), artificial surfaces (28%) and cropland (25%) within 3 km, trees (61%) within 16 km, and trees (83%) within 80 km.

3 km

474 m

trees 32%

16 km

2,148 m

trees 61%

80 km

3,154 m

trees 83%

treesgrasslandcroplandartificial surfacesbare terrainwater

← December Tōmi year-round climate February →Best places to visit in January

January weather nearby: Komoro 8.0 km · Ueda 9.0 km · Kamimaruko 9.0 km · Miyota 14 km · Saku 19 km · Sakaki 20 km · Karuizawa 24 km · Chikuma 31 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 Tōmi (36.3558°, 138.3609°, elevation 639 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	3	-4
2	3	-5
3	3	-5
4	3	-5
5	3	-5
6	3	-5
7	3	-5
8	3	-5
9	3	-5
10	3	-5
11	3	-5
12	3	-5
13	3	-5
14	3	-6
15	3	-6
16	3	-6
17	3	-6
18	2	-6
19	2	-6
20	2	-6
21	2	-6
22	2	-6
23	2	-6
24	2	-6
25	2	-6
26	2	-6
27	2	-6
28	2	-6
29	2	-6
30	2	-6
31	3	-6

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	61	39
6	61	39
7	61	39
8	60	40
9	60	40
10	59	41
11	58	42
12	57	43
13	57	43
14	55	45
15	55	45
16	55	45
17	53	47
18	53	47
19	52	48
20	52	48
21	52	48
22	52	48
23	52	48
24	52	48
25	52	48
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

	Rain chance (%)	Snow chance (%)
1	32	31
2	32	31
3	32	31
4	31	31
5	31	31
6	31	31
7	30	31
8	30	31
9	30	31
10	30	31
11	30	31
12	30	32
13	30	32
14	31	32
15	31	33
16	31	33
17	31	34
18	32	34
19	32	34
20	32	35
21	33	35
22	33	35
23	33	35
24	34	35
25	34	35
26	34	34
27	34	34
28	33	33
29	33	32
30	33	32
31	33	32

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	3	-4
2	3	-5
3	3	-5
4	3	-5
5	3	-5
6	3	-5
7	3	-5
8	3	-5
9	3	-5
10	3	-5
11	3	-5
12	3	-5
13	3	-5
14	3	-6
15	3	-6
16	3	-6
17	3	-6
18	2	-6
19	2	-6
20	2	-6
21	2	-6
22	2	-6
23	2	-6
24	2	-6
25	2	-6
26	2	-6
27	2	-6
28	2	-6
29	2	-6
30	2	-6
31	3	-6

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	61	39
6	61	39
7	61	39
8	60	40
9	60	40
10	59	41
11	58	42
12	57	43
13	57	43
14	55	45
15	55	45
16	55	45
17	53	47
18	53	47
19	52	48
20	52	48
21	52	48
22	52	48
23	52	48
24	52	48
25	52	48
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

	Rain chance (%)	Snow chance (%)
1	32	31
2	32	31
3	32	31
4	31	31
5	31	31
6	31	31
7	30	31
8	30	31
9	30	31
10	30	31
11	30	31
12	30	32
13	30	32
14	31	32
15	31	33
16	31	33
17	31	34
18	32	34
19	32	34
20	32	35
21	33	35
22	33	35
23	33	35
24	34	35
25	34	35
26	34	34
27	34	34
28	33	33
29	33	32
30	33	32
31	33	32

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	3	-4
2	3	-5
3	3	-5
4	3	-5
5	3	-5
6	3	-5
7	3	-5
8	3	-5
9	3	-5
10	3	-5
11	3	-5
12	3	-5
13	3	-5
14	3	-6
15	3	-6
16	3	-6
17	3	-6
18	2	-6
19	2	-6
20	2	-6
21	2	-6
22	2	-6
23	2	-6
24	2	-6
25	2	-6
26	2	-6
27	2	-6
28	2	-6
29	2	-6
30	2	-6
31	3	-6

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	61	39
6	61	39
7	61	39
8	60	40
9	60	40
10	59	41
11	58	42
12	57	43
13	57	43
14	55	45
15	55	45
16	55	45
17	53	47
18	53	47
19	52	48
20	52	48
21	52	48
22	52	48
23	52	48
24	52	48
25	52	48
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

	Rain chance (%)	Snow chance (%)
1	32	31
2	32	31
3	32	31
4	31	31
5	31	31
6	31	31
7	30	31
8	30	31
9	30	31
10	30	31
11	30	31
12	30	32
13	30	32
14	31	32
15	31	33
16	31	33
17	31	34
18	32	34
19	32	34
20	32	35
21	33	35
22	33	35
23	33	35
24	34	35
25	34	35
26	34	34
27	34	34
28	33	33
29	33	32
30	33	32
31	33	32

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100