Caldwell weather in January

In January, Caldwell sees average daytime highs of 41°F and overnight lows near 27°F, with 1.5 in of precipitation across 8.7 wet days and about 9.1 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 39°F in the first days to 43°F by the end. The sky is clear or mostly clear about 25% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 48 min at the start of January to 9 h 36 min by month's end. Set against the rest of the year, January is Caldwell's 12th-clearest and 12th-windiest month. For the whole year in context, see Caldwell's year-round climate.

Daytime high: 41°; 11th warmest
Overnight low: 27°; 1st coldest
Precipitation: 1.5 in; 8.7 wet days
Daylight: 9 h 06 min; 8:23 AM – 5:29 PM
Cloud cover: 65%; 12th clearest
Wind: 4 mph; 12th windiest
Solar energy: 1.86 kWh/m²
Travel score: 0.1; out of 10

Caldwell is city in and county seat of Canyon County, Idaho, United States.

Density: 898/km²; people per km²
Founded: 1883

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

← December Caldwell 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

Highs climb over the month, from about 39°F in the first days to 43°F by the end.

A typical January day in Caldwell reaches about 41°F in the afternoon and slips back to 27°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 30°F and 50°F. Set against its neighbours, January runs on par with December and about 7°F 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 (°F)	39	39	39	39	39	39	39	39	39	40	40	40	40	40	40	40	41	41	41	41	41	41	42	42	42	42	42	43	43	43	43
Avg low (°F)	26	26	26	26	26	26	26	26	26	26	26	27	27	27	27	27	27	27	27	27	27	27	27	27	27	28	28	28	28	28	28

	Avg high (°F)	Avg low (°F)
1	39	26
2	39	26
3	39	26
4	39	26
5	39	26
6	39	26
7	39	26
8	39	26
9	39	26
10	40	26
11	40	26
12	40	27
13	40	27
14	40	27
15	40	27
16	40	27
17	41	27
18	41	27
19	41	27
20	41	27
21	41	27
22	41	27
23	42	27
24	42	27
25	42	27
26	42	28
27	42	28
28	43	28
29	43	28
30	43	28
31	43	28

How January really feels in Caldwell

Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

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

Caldwell weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	41° / 27°	1.5	8.7	3.7	9.1	0.1
Feb	48° / 30°	1.0	7	2.1	10.2	1.7
Mar	58° / 37°	1.2	8	0.5	11.6	4.4
Apr	65° / 42°	1.0	6.2	0.1	13.2	6.4
May	75° / 50°	1.0	5.7	0	14.5	7.6
Jun	83° / 57°	0.5	3.1	0	15.2	6.8
Jul	94° / 64°	0.1	0.7	0	14.9	3.7
Aug	92° / 62°	0.1	0.9	0	13.8	4.3
Sep	81° / 54°	0.4	2	0	12.3	7.7
Oct	66° / 43°	0.7	4	0	10.8	7.1
Nov	50° / 34°	1.1	7.4	1	9.5	2.5
Dec	40° / 27°	1.7	9.3	3.5	8.8	0.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of January, with mostly cloudy or overcast conditions the remaining 61%. Skies tend to open up 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 (%)	39	38	38	37	37	36	36	38	38	37	37	37	38	38	38	38	40	40	39	39	40	40	41	40	41	41	41	42	43	43	43
Cloudier (%)	61	62	62	63	63	64	64	62	62	63	63	63	62	62	62	62	60	60	61	61	60	60	59	60	59	59	59	58	57	57	57

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	37	63
5	37	63
6	36	64
7	36	64
8	38	62
9	38	62
10	37	63
11	37	63
12	37	63
13	38	62
14	38	62
15	38	62
16	38	62
17	40	60
18	40	60
19	39	61
20	39	61
21	40	60
22	40	60
23	41	59
24	40	60
25	41	59
26	41	59
27	41	59
28	42	58
29	43	57
30	43	57
31	43	57

Chance of precipitation in January

Any precipitationSnow

Caldwell gets around 1.5 in of rain and snow over 8.7 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 28% and peaks near 30% on the wettest days, and about 4 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 (%)	29	29	28	28	28	28	28	28	28	28	28	29	29	29	29	29	30	29	29	29	29	29	29	29	28	28	27	27	26	26	25
Snow chance (%)	13	13	13	13	13	13	13	13	13	13	13	13	13	12	12	12	12	12	12	12	12	12	12	11	11	11	11	11	11	11	10

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

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 4 mph in January, the calmest month.

Across January, daily wind ranges from about 4 mph on the calmest days to 4 mph 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 (mph)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
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 (mph)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm
31	4	calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 48 min at the start of January to 9 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over January. Sunrise moves from 8:26 AM to 8:13 AM, and sunset from 5:14 PM to 5:47 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)	8.8	8.8	8.8	8.8	8.9	8.9	8.9	8.9	8.9	8.9	9.0	9.0	9.0	9.0	9.1	9.1	9.1	9.1	9.2	9.2	9.2	9.3	9.3	9.3	9.4	9.4	9.4	9.5	9.5	9.5	9.6
Sunrise (AM)	8:26	8:26	8:26	8:26	8:26	8:26	8:26	8:26	8:26	8:25	8:25	8:25	8:25	8:24	8:24	8:23	8:23	8:22	8:22	8:21	8:21	8:20	8:19	8:19	8:18	8:17	8:16	8:16	8:15	8:14	8:13
Sunset (PM)	5:14	5:15	5:15	5:16	5:17	5:18	5:19	5:20	5:21	5:22	5:23	5:24	5:25	5:26	5:28	5:29	5:30	5:31	5:32	5:33	5:35	5:36	5:37	5:38	5:40	5:41	5:42	5:43	5:45	5:46	5:47

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	8.8	8:26	5:14
2	8.8	8:26	5:15
3	8.8	8:26	5:15
4	8.8	8:26	5:16
5	8.9	8:26	5:17
6	8.9	8:26	5:18
7	8.9	8:26	5:19
8	8.9	8:26	5:20
9	8.9	8:26	5:21
10	8.9	8:25	5:22
11	9.0	8:25	5:23
12	9.0	8:25	5:24
13	9.0	8:25	5:25
14	9.0	8:24	5:26
15	9.1	8:24	5:28
16	9.1	8:23	5:29
17	9.1	8:23	5:30
18	9.1	8:22	5:31
19	9.2	8:22	5:32
20	9.2	8:21	5:33
21	9.2	8:21	5:35
22	9.3	8:20	5:36
23	9.3	8:19	5:37
24	9.3	8:19	5:38
25	9.4	8:18	5:40
26	9.4	8:17	5:41
27	9.4	8:16	5:42
28	9.5	8:16	5:43
29	9.5	8:15	5:45
30	9.5	8:14	5:46
31	9.6	8:13	5:47

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.86 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 8.01 kWh/m² in July across the year — January's 1.86 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)	1.6	1.7	1.7	1.7	1.7	1.7	1.7	1.7	1.7	1.7	1.8	1.8	1.8	1.8	1.8	1.8	1.9	1.9	1.9	1.9	2.0	2.0	2.0	2.1	2.1	2.1	2.2	2.2	2.2	2.3	2.3
Level	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	1.6	Dim
2	1.7	Dim
3	1.7	Dim
4	1.7	Dim
5	1.7	Dim
6	1.7	Dim
7	1.7	Dim
8	1.7	Dim
9	1.7	Dim
10	1.7	Dim
11	1.8	Dim
12	1.8	Dim
13	1.8	Dim
14	1.8	Dim
15	1.8	Dim
16	1.8	Dim
17	1.9	Dim
18	1.9	Dim
19	1.9	Dim
20	1.9	Dim
21	2.0	Dim
22	2.0	Moderate
23	2.0	Moderate
24	2.1	Moderate
25	2.1	Moderate
26	2.1	Moderate
27	2.2	Moderate
28	2.2	Moderate
29	2.2	Moderate
30	2.3	Moderate
31	2.3	Moderate

Planning a trip in January

Is January a good time to visit Caldwell?

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

0.1

Sightseeing

11th-best month of the year

0.0

Beach & pool

10th-best month of the year

January is a weaker month for outdoor sightseeing in Caldwell.

What to pack for Caldwell in January

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

In January, Caldwell sees daytime highs around 41°F and nights near 27°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

UV index in Caldwell in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Caldwell peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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)	2	2	4	5	8	8	9	7	6	4	2	1
Level	Low	Moderate	Moderate	High	Very high	Very high	Very high	Very high	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	2	Low
Feb	2	Moderate
Mar	4	Moderate
Apr	5	High
May	8	Very high
Jun	8	Very high
Jul	9	Very high
Aug	7	Very high
Sep	6	High
Oct	4	Moderate
Nov	2	Low
Dec	1	Low

Air quality in Caldwell 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 Caldwell is worst in August — around 31 µg/m³ PM2.5 (moderate), about 5.0× the cleanest month (December, 6 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)	7	8	10	9	10	8	15	31	16	11	8	6
Level	Good	Good	Good	Good	Good	Good	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	7	Good
Feb	8	Good
Mar	10	Good
Apr	9	Good
May	10	Good
Jun	8	Good
Jul	15	Moderate
Aug	31	Moderate
Sep	16	Moderate
Oct	11	Good
Nov	8	Good
Dec	6	Good

Location & terrain

Where is Caldwell?

Caldwell sits at 43.7°N, 116.7°W, 2,375 ft above sea level, in United States. The nearest listed city is Nampa, 11 mi away.

Topography around Caldwell

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Caldwell.

Within 2 miles, the terrain around Caldwell has only modest variations in elevation — a maximum elevation change of 141 ft around an average of 2,385 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 620 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,283 ft.

The land around Caldwell is covered by artificial surfaces (37%) within 2 miles, cropland (48%) and grassland (21%) within 10 miles, and grassland (70%) within 50 miles.

2 miles

141 ft

artificial surfaces 37%

10 miles

620 ft

cropland 48%

50 miles

6,283 ft

grassland 70%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

January weather nearby: Nampa 11 mi · Meridian 15 mi · Eagle 17 mi · Kuna 18 mi · Boise 24 mi · Twin Falls 135 mi · Pendleton 173 mi · Walla Walla 185 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
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 Caldwell (43.6629°, -116.6874°, elevation 2,375 ft), 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 (°F)	Avg low (°F)
1	39	26
2	39	26
3	39	26
4	39	26
5	39	26
6	39	26
7	39	26
8	39	26
9	39	26
10	40	26
11	40	26
12	40	27
13	40	27
14	40	27
15	40	27
16	40	27
17	41	27
18	41	27
19	41	27
20	41	27
21	41	27
22	41	27
23	42	27
24	42	27
25	42	27
26	42	28
27	42	28
28	43	28
29	43	28
30	43	28
31	43	28

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	37	63
5	37	63
6	36	64
7	36	64
8	38	62
9	38	62
10	37	63
11	37	63
12	37	63
13	38	62
14	38	62
15	38	62
16	38	62
17	40	60
18	40	60
19	39	61
20	39	61
21	40	60
22	40	60
23	41	59
24	40	60
25	41	59
26	41	59
27	41	59
28	42	58
29	43	57
30	43	57
31	43	57

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

	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 (°F)	Avg low (°F)
1	39	26
2	39	26
3	39	26
4	39	26
5	39	26
6	39	26
7	39	26
8	39	26
9	39	26
10	40	26
11	40	26
12	40	27
13	40	27
14	40	27
15	40	27
16	40	27
17	41	27
18	41	27
19	41	27
20	41	27
21	41	27
22	41	27
23	42	27
24	42	27
25	42	27
26	42	28
27	42	28
28	43	28
29	43	28
30	43	28
31	43	28

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	37	63
5	37	63
6	36	64
7	36	64
8	38	62
9	38	62
10	37	63
11	37	63
12	37	63
13	38	62
14	38	62
15	38	62
16	38	62
17	40	60
18	40	60
19	39	61
20	39	61
21	40	60
22	40	60
23	41	59
24	40	60
25	41	59
26	41	59
27	41	59
28	42	58
29	43	57
30	43	57
31	43	57

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

	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 (°F)	Avg low (°F)
1	39	26
2	39	26
3	39	26
4	39	26
5	39	26
6	39	26
7	39	26
8	39	26
9	39	26
10	40	26
11	40	26
12	40	27
13	40	27
14	40	27
15	40	27
16	40	27
17	41	27
18	41	27
19	41	27
20	41	27
21	41	27
22	41	27
23	42	27
24	42	27
25	42	27
26	42	28
27	42	28
28	43	28
29	43	28
30	43	28
31	43	28

	Clearer (%)	Cloudier (%)
1	39	61
2	38	62
3	38	62
4	37	63
5	37	63
6	36	64
7	36	64
8	38	62
9	38	62
10	37	63
11	37	63
12	37	63
13	38	62
14	38	62
15	38	62
16	38	62
17	40	60
18	40	60
19	39	61
20	39	61
21	40	60
22	40	60
23	41	59
24	40	60
25	41	59
26	41	59
27	41	59
28	42	58
29	43	57
30	43	57
31	43	57

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

	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