Iida weather in January

In January, Iida sees average daytime highs of 2°C and overnight lows near -7°C, with 99 mm of precipitation across 11.7 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 2°C through the month. The sky is clear or mostly clear about 39% 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 12 min by month's end. Set against the rest of the year, January is Iida's 3rd-clearest and 4th-windiest month. For the whole year in context, see Iida's year-round climate.

Daytime high: 2°; 12th warmest
Overnight low: -7°; 1st coldest
Precipitation: 99 mm; 11.7 wet days
Daylight: 9 h 48 min; 7:03 AM – 4:53 PM
Cloud cover: 51%; 3rd clearest
Wind: 6 km/h; 4th windiest
Solar energy: 2.95 kWh/m²
Travel score: 0.0; out of 10

Iida is city in Nagano Prefecture, Japan.

Density: 154/km²; people per km²
Founded: 1937

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

← December Iida 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 2°C through the month.

A typical January day in Iida reaches about 2°C in the afternoon and slips back to -7°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between -2°C and 6°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	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2
Avg low (°C)	-6	-6	-6	-6	-6	-6	-6	-6	-7	-7	-7	-7	-7	-7	-7	-7	-7	-7	-7	-7	-8	-8	-8	-8	-8	-8	-8	-8	-8	-8	-8

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

How January really feels in Iida

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

18 feel bitter (≤ -10°C)

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

Iida weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	2° / -7°	99	11.7	11	9.9	0.0
Feb	3° / -6°	107	10.2	8.1	10.7	0.0
Mar	8° / -2°	171	13.1	7	11.7	1.1
Apr	14° / 4°	174	12.9	1.4	12.9	3.6
May	19° / 9°	191	13.7	0	13.8	5.4
Jun	22° / 14°	263	18	0	14.4	5.0
Jul	25° / 18°	308	20.3	0	14.2	5.0
Aug	27° / 19°	184	18.6	0	13.3	5.3
Sep	23° / 15°	228	15.5	0	12.2	5.7
Oct	18° / 9°	210	12.9	0	11.1	5.3
Nov	11° / 3°	126	10.4	1.2	10.1	2.9
Dec	5° / -3°	100	12	7.9	9.6	0.3

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 39% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 19% of January, with mostly cloudy or overcast conditions the remaining 42%.

	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 (%)	62	63	63	63	63	62	62	61	61	60	59	59	58	58	57	56	55	55	55	55	54	54	55	55	55	55	56	57	57	57	58
Cloudier (%)	38	37	37	37	37	38	38	39	39	40	41	41	42	42	43	44	45	45	45	45	46	46	45	45	45	45	44	43	43	43	42

	Clearer (%)	Cloudier (%)
1	62	38
2	63	37
3	63	37
4	63	37
5	63	37
6	62	38
7	62	38
8	61	39
9	61	39
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	56	44
17	55	45
18	55	45
19	55	45
20	55	45
21	54	46
22	54	46
23	55	45
24	55	45
25	55	45
26	55	45
27	56	44
28	57	43
29	57	43
30	57	43
31	58	42

Chance of precipitation in January

Any precipitationSnow

Iida gets around 99 mm of rain and snow over 11.7 wet days in January, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 39% on the wettest days, and about 11 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 (%)	37	37	37	37	37	37	37	37	38	38	38	38	39	39	39	39	39	39	39	39	39	39	39	39	38	38	38	37	37	37	37
Snow chance (%)	33	34	34	34	34	34	34	34	34	34	34	35	35	35	36	36	36	36	36	37	37	37	37	37	37	37	36	36	36	35	35

	Rain chance (%)	Snow chance (%)
1	37	33
2	37	34
3	37	34
4	37	34
5	37	34
6	37	34
7	37	34
8	37	34
9	38	34
10	38	34
11	38	34
12	38	35
13	39	35
14	39	35
15	39	36
16	39	36
17	39	36
18	39	36
19	39	36
20	39	37
21	39	37
22	39	37
23	39	37
24	39	37
25	38	37
26	38	37
27	38	36
28	37	36
29	37	36
30	37	35
31	37	35

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 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over January. Sunrise moves from 7:03 AM to 6:56 AM, and sunset from 4:41 PM to 5:08 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	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.7	9.8	9.8	9.8	9.8	9.8	9.8	9.9	9.9	9.9	9.9	9.9	10.0	10.0	10.0	10.0	10.1	10.1	10.1	10.1	10.2	10.2
Sunrise (AM)	7:03	7:03	7:03	7:03	7:03	7:03	7:03	7:04	7:04	7:03	7:03	7:03	7:03	7:03	7:03	7:03	7:02	7:02	7:02	7:02	7:01	7:01	7:00	7:00	6:59	6:59	6:58	6:58	6:57	6:57	6:56
Sunset (PM)	4:41	4:42	4:42	4:43	4:44	4:45	4:46	4:46	4:47	4:48	4:49	4:50	4:51	4:52	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	5:05	5:06	5:07	5:08

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	9.6	7:03	4:41
2	9.6	7:03	4:42
3	9.7	7:03	4:42
4	9.7	7:03	4:43
5	9.7	7:03	4:44
6	9.7	7:03	4:45
7	9.7	7:03	4:46
8	9.7	7:04	4:46
9	9.7	7:04	4:47
10	9.7	7:03	4:48
11	9.8	7:03	4:49
12	9.8	7:03	4:50
13	9.8	7:03	4:51
14	9.8	7:03	4:52
15	9.8	7:03	4:52
16	9.8	7:03	4:53
17	9.9	7:02	4:54
18	9.9	7:02	4:55
19	9.9	7:02	4:56
20	9.9	7:02	4:57
21	9.9	7:01	4:58
22	10.0	7:01	4:59
23	10.0	7:00	5:00
24	10.0	7:00	5:01
25	10.0	6:59	5:02
26	10.1	6:59	5:03
27	10.1	6:58	5:04
28	10.1	6:58	5:05
29	10.1	6:57	5:06
30	10.2	6:57	5:07
31	10.2	6:56	5:08

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.95 kWh/m².

For context, solar energy here swings from a low near 2.52 kWh/m² to a high of 5.47 kWh/m² in May across the year — January's 2.95 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)	2.8	2.8	2.8	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	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	2.8	Moderate
2	2.8	Moderate
3	2.8	Moderate
4	2.8	Moderate
5	2.8	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	2.9	Moderate
15	2.9	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 Iida?

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 Iida.

What to pack for Iida in January

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

In January, Iida sees daytime highs around 2°C and nights near -7°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

UV index in Iida 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 Iida peaks around July 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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	5	6	7	9	10	11	9	10	6	4	2
Level	Moderate	Moderate	High	Very high	Very high	Extreme	Extreme	Very high	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	5	Moderate
Mar	6	High
Apr	7	Very high
May	9	Very high
Jun	10	Extreme
Jul	11	Extreme
Aug	9	Very high
Sep	10	Very high
Oct	6	High
Nov	4	Moderate
Dec	2	Moderate

Air quality in Iida 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 Iida is worst in April — around 18 µg/m³ PM2.5 (moderate), about 2.4× 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	16	18	17	15	11	11	10	9	8	8
Level	Good	Good	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	9	Good
Feb	11	Good
Mar	16	Moderate
Apr	18	Moderate
May	17	Moderate
Jun	15	Moderate
Jul	11	Good
Aug	11	Good
Sep	10	Good
Oct	9	Good
Nov	8	Good
Dec	8	Good

Location & terrain

Where is Iida?

Iida sits at 35.5°N, 137.8°E, 517 m above sea level, in Japan. The nearest listed city is Komagane, 24 km away.

Topography around Iida

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

Within 3 km, the terrain around Iida has large variations in elevation — a maximum elevation change of 733 m around an average of 565 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,037 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,167 m.

The land around Iida is covered by artificial surfaces (53%) and trees (36%) within 3 km, trees (86%) within 16 km, and trees (90%) within 80 km.

3 km

733 m

artificial surfaces 53%

16 km

2,037 m

trees 86%

80 km

3,167 m

trees 90%

treesgrasslandcroplandartificial surfaceswater

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

January weather nearby: Komagane 24 km · Nakatsugawa 29 km · Ina 36 km · Ena 40 km · Minamiminowa 42 km · Kinoshita 45 km · Tatsuno 54 km · Mizunami 54 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 Iida (35.5196°, 137.8207°, elevation 517 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	-6
2	3	-6
3	3	-6
4	3	-6
5	3	-6
6	2	-6
7	2	-6
8	2	-6
9	2	-7
10	2	-7
11	2	-7
12	2	-7
13	2	-7
14	2	-7
15	2	-7
16	2	-7
17	2	-7
18	2	-7
19	2	-7
20	2	-7
21	2	-8
22	2	-8
23	2	-8
24	2	-8
25	2	-8
26	2	-8
27	2	-8
28	2	-8
29	2	-8
30	2	-8
31	2	-8

	Clearer (%)	Cloudier (%)
1	62	38
2	63	37
3	63	37
4	63	37
5	63	37
6	62	38
7	62	38
8	61	39
9	61	39
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	56	44
17	55	45
18	55	45
19	55	45
20	55	45
21	54	46
22	54	46
23	55	45
24	55	45
25	55	45
26	55	45
27	56	44
28	57	43
29	57	43
30	57	43
31	58	42

	Rain chance (%)	Snow chance (%)
1	37	33
2	37	34
3	37	34
4	37	34
5	37	34
6	37	34
7	37	34
8	37	34
9	38	34
10	38	34
11	38	34
12	38	35
13	39	35
14	39	35
15	39	36
16	39	36
17	39	36
18	39	36
19	39	36
20	39	37
21	39	37
22	39	37
23	39	37
24	39	37
25	38	37
26	38	37
27	38	36
28	37	36
29	37	36
30	37	35
31	37	35

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

	Clearer (%)	Cloudier (%)
1	62	38
2	63	37
3	63	37
4	63	37
5	63	37
6	62	38
7	62	38
8	61	39
9	61	39
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	56	44
17	55	45
18	55	45
19	55	45
20	55	45
21	54	46
22	54	46
23	55	45
24	55	45
25	55	45
26	55	45
27	56	44
28	57	43
29	57	43
30	57	43
31	58	42

	Rain chance (%)	Snow chance (%)
1	37	33
2	37	34
3	37	34
4	37	34
5	37	34
6	37	34
7	37	34
8	37	34
9	38	34
10	38	34
11	38	34
12	38	35
13	39	35
14	39	35
15	39	36
16	39	36
17	39	36
18	39	36
19	39	36
20	39	37
21	39	37
22	39	37
23	39	37
24	39	37
25	38	37
26	38	37
27	38	36
28	37	36
29	37	36
30	37	35
31	37	35

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

	Clearer (%)	Cloudier (%)
1	62	38
2	63	37
3	63	37
4	63	37
5	63	37
6	62	38
7	62	38
8	61	39
9	61	39
10	60	40
11	59	41
12	59	41
13	58	42
14	58	42
15	57	43
16	56	44
17	55	45
18	55	45
19	55	45
20	55	45
21	54	46
22	54	46
23	55	45
24	55	45
25	55	45
26	55	45
27	56	44
28	57	43
29	57	43
30	57	43
31	58	42

	Rain chance (%)	Snow chance (%)
1	37	33
2	37	34
3	37	34
4	37	34
5	37	34
6	37	34
7	37	34
8	37	34
9	38	34
10	38	34
11	38	34
12	38	35
13	39	35
14	39	35
15	39	36
16	39	36
17	39	36
18	39	36
19	39	36
20	39	37
21	39	37
22	39	37
23	39	37
24	39	37
25	38	37
26	38	37
27	38	36
28	37	36
29	37	36
30	37	35
31	37	35

	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